[clang-tools-extra] [clangd] Check for editsNearCursor client capability under experimental capabilities (PR #114699)

[Haojian Wu via cfe-commits]

https://github.com/hokein commented:

(No action required) – we have other extensions in clangd e.g. `references.container` `offsetEncoding`. Do we plan to do the same thing for them?

https://github.com/llvm/llvm-project/pull/114699