Tests

Improve sampling and grammar lifecycle management, fix memory growth … #523

Job	Run time
build-and-test (ubuntu-latest, 3.9)	3m 13s
build-and-test (ubuntu-latest, 3.13)	3m 20s
build-and-test (macos-14, 3.13, -DLLAMA_METAL=off, (No Metal))	2m 35s
build-and-test (ubuntu-latest, 3.14)	2m 59s
build-and-test (macos-14, 3.13, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBR...	2m 33s
build-and-test (windows-latest, 3.13)	6m 36s
build-and-test (macos-14, 3.14, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBR...	2m 27s
build-and-test (macos-14, 3.9, -DLLAMA_METAL=off, (No Metal))	2m 52s
build-and-test (macos-14, 3.9, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBRA...	2m 57s
build-and-test (macos-14, 3.14, -DLLAMA_METAL=off, (No Metal))	3m 27s
build-and-test (windows-latest, 3.14)	7m 29s
build-and-test (windows-latest, 3.9)	7m 36s
	48m 4s

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