feat(stdlib): Add `Char.encodedLength` #9825

Job	Run time
Build and test on macos-latest / Dependencies / Create dependencies cache	6s
Build and test on windows-latest / Dependencies / Create dependencies cache	11s
Build and test on ubuntu-latest / Dependencies / Create dependencies cache	3s
Build and test on ubuntu-latest / (native) Build and test / (native) Build and test	5m 23s
Build and test on ubuntu-latest / (js) Build and test / (js) Build and test	11m 8s
Build and test on macos-latest / (js) Build and test / (js) Build and test	11m 11s
Build and test on macos-latest / (native) Build and test / (native) Build and test	6m 44s
Build and test on windows-latest / (native) Build and test / (native) Build and test	10m 41s
Build and test on windows-latest / (js) Build and test / (js) Build and test	10m 39s
Test pkg binaries	1s
	56m 7s

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