feat: Add `Char.byteCount` #9790

Job	Run time
Build and test on windows-latest / Dependencies / Create dependencies cache	12s
Build and test on ubuntu-latest / Dependencies / Create dependencies cache	6s
Build and test on macos-latest / Dependencies / Create dependencies cache	7s
Build and test on ubuntu-latest / (js) Build and test / (js) Build and test	13m 2s
Build and test on ubuntu-latest / (native) Build and test / (native) Build and test	5m 31s
Build and test on macos-latest / (js) Build and test / (js) Build and test	28m 19s
Build and test on macos-latest / (native) Build and test / (native) Build and test	7m 49s
Build and test on windows-latest / (js) Build and test / (js) Build and test	15m 7s
Build and test on windows-latest / (native) Build and test / (native) Build and test	13m 45s
Test pkg binaries / Test pkg binary on ubuntu-latest	49s
Test pkg binaries / Test pkg binary on macos-latest	1m 1s
Test pkg binaries / Test pkg binary on windows-latest	22s
	1h 26m 10s

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