Add function OS::get_real_path() #2296

Job	Run time
📊 Static checks / Code style, file formatting, and docs	41s
🌐 Web / Template w/o threads (target=template_release, threads=no)	16m 57s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	20m 41s
🤖 Android / Template arm64 (target=template_release, arch=arm64)	15m 54s
🍏 iOS / Template (target=template_release)	11m 7s
🏁 Windows / Template (target=template_release)	28m 47s
🏁 Windows / Template w/ GCC (target=template_release, use_mingw=yes)	40m 22s
🤖 Android / Template arm32 (target=template_release, arch=arm32)	15m 0s
🏁 Windows / Editor (target=editor)	44m 51s
🍎 macOS / Editor (target=editor)	56m 47s
🍎 macOS / Template (target=template_release)	23m 40s
🐧 Linux / Template w/ Mono, release (target=template_release)	20m 6s
🐧 Linux / Editor with ThreadSanitizer (target=editor, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	27m 15s
🐧 Linux / Minimal template (target=template_release, everything disabled)	12m 18s
🐧 Linux / Template w/ Mono, debug (target=template_debug)	21m 42s
🐧 Linux / Editor w/ Mono (target=editor)	43m 21s
	6h 39m 29s

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