ci: add test and build workflows

[latonis]

• added a test workflow
• added a build workflow
• updated badge

[github-actions]

Benchmark Results

flatten_inputs/default/small
                        time:   [792.02 ns 792.51 ns 792.96 ns]
                        thrpt:  [1.2611 Melem/s 1.2618 Melem/s 1.2626 Melem/s]
                 change:
                        time:   [-0.9510% -0.7082% -0.5360%] (p = 0.00 < 0.05)
                        thrpt:  [+0.5389% +0.7133% +0.9601%]
flatten_inputs/preserve_arrays/small
                        time:   [872.90 ns 875.17 ns 878.93 ns]
                        thrpt:  [1.1378 Melem/s 1.1426 Melem/s 1.1456 Melem/s]
                 change:
                        time:   [-1.1007% -0.5663% -0.0526%] (p = 0.03 < 0.05)
                        thrpt:  [+0.0526% +0.5695% +1.1129%]
flatten_inputs/alt_array_flattening/small
                        time:   [870.52 ns 870.83 ns 871.20 ns]
                        thrpt:  [1.1478 Melem/s 1.1483 Melem/s 1.1487 Melem/s]
                 change:
                        time:   [-0.7240% -0.5491% -0.3807%] (p = 0.00 < 0.05)
                        thrpt:  [+0.3822% +0.5521% +0.7293%]
flatten_inputs/default/medium
                        time:   [34.499 µs 34.508 µs 34.516 µs]
                        thrpt:  [28.972 Kelem/s 28.979 Kelem/s 28.986 Kelem/s]
                 change:
                        time:   [+1.5692% +1.8279% +1.9902%] (p = 0.00 < 0.05)
                        thrpt:  [-1.9513% -1.7951% -1.5449%]
                        Performance has regressed.
flatten_inputs/preserve_arrays/medium
                        time:   [33.744 µs 33.759 µs 33.780 µs]
                        thrpt:  [29.603 Kelem/s 29.621 Kelem/s 29.635 Kelem/s]
                 change:
                        time:   [+0.1704% +0.4057% +0.6510%] (p = 0.00 < 0.05)
                        thrpt:  [-0.6468% -0.4041% -0.1701%]
flatten_inputs/alt_array_flattening/medium
                        time:   [34.534 µs 34.547 µs 34.567 µs]
                        thrpt:  [28.929 Kelem/s 28.946 Kelem/s 28.957 Kelem/s]
                 change:
                        time:   [-0.1429% +0.1020% +0.2775%] (p = 0.41 > 0.05)
                        thrpt:  [-0.2767% -0.1019% +0.1431%]
flatten_inputs/default/large
                        time:   [770.67 µs 771.33 µs 772.07 µs]
                        thrpt:  [1.2952 Kelem/s 1.2965 Kelem/s 1.2976 Kelem/s]
                 change:
                        time:   [-0.3912% -0.2451% -0.1117%] (p = 0.00 < 0.05)
                        thrpt:  [+0.1118% +0.2457% +0.3928%]
flatten_inputs/preserve_arrays/large
                        time:   [772.71 µs 773.30 µs 773.89 µs]
                        thrpt:  [1.2922 Kelem/s 1.2932 Kelem/s 1.2941 Kelem/s]
                 change:
                        time:   [-0.2919% -0.1446% -0.0035%] (p = 0.05 < 0.05)
                        thrpt:  [+0.0035% +0.1448% +0.2927%]
flatten_inputs/alt_array_flattening/large
                        time:   [771.55 µs 772.04 µs 772.52 µs]
                        thrpt:  [1.2945 Kelem/s 1.2953 Kelem/s 1.2961 Kelem/s]
                 change:
                        time:   [-0.2903% -0.1037% +0.0516%] (p = 0.26 > 0.05)
                        thrpt:  [-0.0516% +0.1038% +0.2912%]
flatten_collisions/collisions_default/10
                        time:   [1.3284 µs 1.3303 µs 1.3329 µs]
                        thrpt:  [750.23 Kelem/s 751.71 Kelem/s 752.78 Kelem/s]
                 change:
                        time:   [+0.2422% +1.3239% +2.4164%] (p = 0.01 < 0.05)
                        thrpt:  [-2.3594% -1.3066% -0.2416%]
flatten_collisions/collisions_alt_flatten/10
                        time:   [1.2478 µs 1.2523 µs 1.2567 µs]
                        thrpt:  [795.71 Kelem/s 798.56 Kelem/s 801.38 Kelem/s]
                 change:
                        time:   [-3.4505% -3.2472% -3.0628%] (p = 0.00 < 0.05)
                        thrpt:  [+3.1596% +3.3562% +3.5738%]
                        Performance has improved.
flatten_collisions/collisions_default/100
                        time:   [11.970 µs 11.974 µs 11.977 µs]
                        thrpt:  [83.491 Kelem/s 83.517 Kelem/s 83.544 Kelem/s]
                 change:
                        time:   [+2.8671% +3.2152% +3.8382%] (p = 0.00 < 0.05)
                        thrpt:  [-3.6963% -3.1151% -2.7872%]
                        Performance has regressed.
flatten_collisions/collisions_alt_flatten/100
                        time:   [12.176 µs 12.183 µs 12.195 µs]
                        thrpt:  [82.003 Kelem/s 82.081 Kelem/s 82.131 Kelem/s]
                 change:
                        time:   [+3.4253% +3.5719% +3.7146%] (p = 0.00 < 0.05)
                        thrpt:  [-3.5815% -3.4487% -3.3119%]
                        Performance has regressed.
flatten_collisions/collisions_default/1000
                        time:   [116.80 µs 117.19 µs 117.92 µs]
                        thrpt:  [8.4804 Kelem/s 8.5329 Kelem/s 8.5619 Kelem/s]
                 change:
                        time:   [+1.0667% +1.4090% +1.7809%] (p = 0.00 < 0.05)
                        thrpt:  [-1.7498% -1.3894% -1.0555%]
                        Performance has regressed.
flatten_collisions/collisions_alt_flatten/1000
                        time:   [115.40 µs 115.51 µs 115.62 µs]
                        thrpt:  [8.6491 Kelem/s 8.6572 Kelem/s 8.6653 Kelem/s]
                 change:
                        time:   [-0.8436% -0.5927% -0.3463%] (p = 0.00 < 0.05)
                        thrpt:  [+0.3475% +0.5963% +0.8508%]

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Benchmarked on commit 3c8394edb57b92d229115a41ed40ada78d1cfe76