Use BROTLI_MAX_STATIC_CONTEXTS instead of magic constants in encode.c #665

Job	Run time
Build and test cmake:gcc9	27s
Build and test cmake:clang15	34s
Build and test cmake:clang15:asan	46s
Build and test cmake:clang15:tsan	42s
Build and test cmake:clang15:ubsan	51s
Build and test cmake:qemu-arm-neon-gcc	1m 2s
Build and test cmake-osx:clang	35s
Build and test cmake-osx:gcc	52s
Build and test cmake-win64:msvc-rel	1m 4s
Build and test cmake-win64:msvc-dbg	51s
Build and test fuzz:clang15	34s
Build and test python3.10:clang15	1m 48s
Build and test python3.10-win	31s
Build and test maven	27s
Build and test bazel:root	30s
Build and test bazel:go	1m 7s
Build and test bazel:java	2m 16s
Build and test bazel:research	31s
Build and test bazel-osx:root	1m 18s
Build and test bazel-osx:go	1m 54s
Build and test bazel-osx:java	3m 21s
Build and test bazel-osx:research	1m 8s
Build and test bazel-win:root	1m 39s
Build and test bazel-win:java	4m 36s
Build and test bazel-win:research	1m 27s
	30m 51s

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