Add hsDarwin.h with helpers for string conversion #2368

Job	Run time
linux-x64-internal-release	8m 56s
linux-x64-internal-debug	8m 0s
linux-x64-external-release	8m 56s
Check for Max SDK	1s
macos-x64-internal-release	11m 5s
macos-x64-internal-debug	10m 46s
macos-x64-external-release	11m 5s
windows-x86-internal-release	16m 14s
windows-x86-internal-debug	14m 14s
windows-x86-external-release	15m 40s
windows-x64-internal-release	14m 55s
windows-x64-internal-debug	13m 57s
windows-x64-external-release	17m 35s
maxplugin-${{ matrix.cfg.str }}-${{ matrix.cfg.sdk-version }}	0s
	2h 31m 24s

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