lsp: go to def for case exprs #863

Job	Run time
pre_job	6s
windows (windows-latest, x86)	2m 31s
linux (ubuntu-latest, x86_64, yum install clang llvm llvm-devel perl-IPC-Cmd -y && python3 -m ens...	3m 46s
linux (ubuntu-latest, aarch64-unknown-linux-gnu, --zig, python3 -m pip install ziglang==0.11.0 )	4m 43s
windows (windows-latest, x64)	2m 28s
macos (macos-14, x86_64)	58s
macos (macos-14, aarch64)	52s
sdist	27s
Release	-1s
	15m 50s

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