Add textDocument/typeDefinition for LSP (#2226)

* Add textDocument/typeDefinition for LSP

Doc to spec https://microsoft.github.io/language-server-protocol/specification#textDocument_typeDefinition

This works like textDocument/definition but resolves a location of a
type of an expression under the cursor.

I'm not sure what to do with tsserver though.

* Fix passing column to LSP
* test_go_to_definition: wording
* Add tests for textDocument/typeDefinition
* Add docs for textDocument/typeDefinition

autoload/ale/lsp.vim

@@ -43,6 +43,7 @@ function! ale#lsp#Register(executable_or_address, project, init_options) abort
         \       'completion': 0,
         \       'completion_trigger_characters': [],
         \       'definition': 0,
+        \       'typeDefinition': 0,
         \       'symbol_search': 0,
         \   },
         \}
@@ -207,6 +208,10 @@ function! s:UpdateCapabilities(conn, capabilities) abort
         let a:conn.capabilities.definition = 1
     endif
 
+    if get(a:capabilities, 'typeDefinitionProvider') is v:true
+        let a:conn.capabilities.typeDefinition = 1
+    endif
+
     if get(a:capabilities, 'workspaceSymbolProvider') is v:true
         let a:conn.capabilities.symbol_search = 1
     endif