Print workspace_config with :verbose LspStatus (#1279)

* Make verbose LspStatus show workspace config

Need the trailing echo to ensure the next lsp server is on a new line.

* Use pretty printing if available

* checkhealth: Print server status and config

Add initial checkhealth support.
See https://github.com/rhysd/vim-healthcheck

Lists server status, advice for failure, and lists workspace config to
help debug issues or understand server state. Doesn't do much error
detecting.

* checkhealth: Print each server config as a section

checkhealth doesn't allow a lot of formatting (no indentation), so it's
hard to make the config output readable. Output each server as a
separate section instead of one giant config block to make the start of
each server easier to see.

autoload/lsp.vim

@@ -148,7 +148,22 @@ let s:color_map = {
 \ 'not running': 'Comment'
 \}
 
-" Print the current status of all servers (if called with no arguments)
+" Collect the current status of all servers
+function! lsp#collect_server_status() abort
+    let l:results = {}
+    for l:k in keys(s:servers)
+        let l:status = s:server_status(l:k)
+        " Copy to prevent callers from corrupting our config.
+        let l:info = deepcopy(s:servers[l:k].server_info)
+        let l:results[l:k] = {
+            \ 'status': l:status,
+            \ 'info': l:info,
+            \ }
+    endfor
+    return l:results
+endfunction
+
+" Print the current status of all servers
 function! lsp#print_server_status() abort
     for l:k in sort(keys(s:servers))
         let l:status = s:server_status(l:k)
@@ -157,6 +172,15 @@ function! lsp#print_server_status() abort
         echon l:status
         echohl None
         echo ''
+        if &verbose
+            let l:cfg = { 'workspace_config': s:servers[l:k].server_info.workspace_config }
+            if get(g:, 'loaded_scriptease', 0)
+                call scriptease#pp_command(0, -1, l:cfg)
+            else
+                echo json_encode(l:cfg)
+            endif
+            echo ''
+        endif
     endfor
 endfunction