feat(stdlib)!: Add an `Ascii` submodule to `Char` and move `isAscii`, `toUppercase`, `toLowercase` #9612

Job	Run time
Build and test on ubuntu-latest / Dependencies / Create dependencies cache	5s
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 / (native) Build and test / (native) Build and test	5m 46s
Build and test on ubuntu-latest / (js) Build and test / (js) Build and test	13m 29s
Build and test on macos-latest / (native) Build and test / (native) Build and test	5m 44s
Build and test on macos-latest / (js) Build and test / (js) Build and test	1h 0m 32s
Build and test on windows-latest / (js) Build and test / (js) Build and test	40m 39s
Build and test on windows-latest / (native) Build and test / (native) Build and test	19m 31s
Test pkg binaries / Test pkg binary on ubuntu-latest	1m 0s
Test pkg binaries / Test pkg binary on macos-latest	1m 19s
Test pkg binaries / Test pkg binary on windows-latest	26s
	2h 28m 48s

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