Initial support for textDocument/hover request. #4220

Job	Run time
ClangTidy	9m 53s
KytheVerification	0s
KytheXrefs	0s
x86_64 test	4m 33s
arm64 test	5m 7s
MacOsBuild	3m 5s
PrepareVSPlugin	2m 19s
x86_64 test-nortti	4m 32s
MacOsBuildDevTools	4m 49s
x86_64 test-c++20	4m 34s
x86_64 test-c++23	4m 33s
VerifyFormatting	1m 42s
WindowsBuild	9m 16s
x86_64 smoke-test	9m 56s
arm64 smoke-test	11m 22s
x86_64 asan	7m 16s
x86_64 asan-clang	5m 52s
x86_64 compile	3m 43s
arm64 compile	3m 55s
x86_64 compile-clang	2m 45s
arm64 compile-clang	3m 52s
x86_64 compile-static	3m 7s
arm64 compile-static	4m 15s
x86_64 compile-static-clang	2m 57s
arm64 compile-static-clang	3m 50s
x86_64 coverage	19m 11s
x86_64 clean	7m 16s
arm64 clean	7m 6s
Build and deploy GitHub pages	10s
📦 Release	0s
	2h 30m 56s

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