Support the official kotlin-lsp #4836
Description
The lsp-mode supports fwcd/kotlin-language-server for now but the official LSP implementation was released in May, and now the author of fwcd/kotlin-language-server says that fwcd/kotlin-language-server can be considered deprecated.
c.f. fwcd/kotlin-language-server@ee05531
The official impelmentation is still pre-alpha phase based on the README, however, it has more feature than the fwcd's one.