Update the types to new specification

[wakaztahir]

Hi, multi line tokens support is required in SemanticTokenClientCapabilities, Please update the types so I can support more stuff, this is easier

https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#semanticTokensClientCapabilities

[kuafuwang]

you can try to update the types . it is very easy. and i will merge you PR.

[wakaztahir]

Also I was thinking was upgrading the project to C++ 20 so that I can remove boost:optional, but there were errors when I changed the standard, could this be done ?

[kuafuwang]

Also I was thinking was upgrading the project to C++ 20 so that I can remove boost:optional, but there were errors when I changed the standard, could this be done ?

don't change to c++ 200 . other user need c++ 14.