Improve Dashboard Performance

[dan-tang-ssd]

This PR is submitted to fix #376

It is now ready for review.

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It contains below changes:

• add migration files to create 4 new tables dashoard_others_snapshot_xxx
• add new command to pre-calculate dashboard OTHERS snapshot; run command at 2:00 AM as daily schedule job
• update Laravel Controller and mysql stored procedure to get OTHERS result from snapshot (pre-calculated) instead of live calculation
• update Vue component to show AS OF date (pre-calculated OTHERS)
• add pest tests
• fix performance issue when running application test

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I tried 3 different institutions
Below is the previous testing result after adding indexes in tables in PR #383

Live env: 11.99 s    Local env: 3.76 s
Live env: 15.92 s    Local env: 5.25 s
Live env: 13.27 s    Local env: 4.24 s

I performed same testing for the same 3 institutions after using pre-calculated OTHERS result:

Live env: 12.04 s    Local env: 894 ms
Live env: 14.33 s    Local env: 1.78 s
Live env: 13.02 s    Local env: 1.86 s

[dan-tang-ssd]

Note for deployment procedure:

1. In order to have a pre-calculated OTHERS result for dashboard, we will need to manually run the new command after live env deployment.

[dan-tang-ssd]

Fixed performance issue for running application test.
Duration: 1334.84s → 58.35s (~23x faster)

It is caused by an unnecessary COMMIT that confused Laravel to reseed the whole database before running next test.