Add ALERename (tsserver & LSP), ALEOrganizeImports (tsserver) and auto import support (tsserver) (#2709)

This commit adds support for renaming symbols in tsserver and with LSP tools, and for organising imports with tsserver. Completion results for symbols that can be imported are now suggested if enabled for tsserver completion done via ALE.

test/completion/test_completion_events.vader

@@ -47,6 +47,14 @@ Before:
     AssertEqual a:expect_success, g:get_completions_called
   endfunction
 
+  let g:handle_code_action_called = 0
+  function! MockHandleCodeAction() abort
+    " delfunction! ale#code_action#HandleCodeAction
+    function! ale#code_action#HandleCodeAction(action) abort
+      let g:handle_code_action_called += 1
+    endfunction
+  endfunction
+
 After:
   Restore
 
@@ -54,6 +62,7 @@ After:
   unlet! g:output
   unlet! g:fake_mode
   unlet! g:get_completions_called
+  unlet! g:handle_code_action_called
   unlet! b:ale_old_omnifunc
   unlet! b:ale_old_completeopt
   unlet! b:ale_completion_info
@@ -61,6 +70,8 @@ After:
   unlet! b:ale_complete_done_time
 
   delfunction CheckCompletionCalled
+  delfunction ale#code_action#HandleCodeAction
+  delfunction MockHandleCodeAction
 
   if exists('*CompleteCallback')
     delfunction CompleteCallback
@@ -77,6 +88,7 @@ After:
   endfunction
 
   runtime autoload/ale/completion.vim
+  runtime autoload/ale/code_action.vim
   runtime autoload/ale/util.vim
 
 Execute(ale#completion#GetCompletions should be called when the cursor position stays the same):
@@ -385,3 +397,44 @@ Execute(Running the normal mode <Plug> keybind should reset the settings):
   AssertEqual 'menu', &l:completeopt
   Assert !has_key(b:, 'ale_old_omnifunc')
   Assert !has_key(b:, 'ale_old_completeopt')
+
+Execute(HandleUserData should call ale#code_action#HandleCodeAction):
+  let b:ale_completion_info = {'source': 'ale-manual'}
+  call MockHandleCodeAction()
+
+  call ale#completion#HandleUserData({})
+  AssertEqual g:handle_code_action_called, 0
+
+  call ale#completion#HandleUserData({
+  \  'user_data': ''
+  \})
+  AssertEqual g:handle_code_action_called, 0
+
+  call ale#completion#HandleUserData({
+  \  'user_data': '{}'
+  \})
+  AssertEqual g:handle_code_action_called, 0
+
+  call ale#completion#HandleUserData({
+  \  'user_data': '{"codeActions": []}'
+  \})
+  AssertEqual g:handle_code_action_called, 0
+
+  call ale#completion#HandleUserData({
+  \  'user_data': '{"codeActions": [{"description":"", "changes": []}]}'
+  \})
+  AssertEqual g:handle_code_action_called, 1
+
+  let b:ale_completion_info = {'source': 'ale-automatic'}
+  call ale#completion#HandleUserData({
+  \  'user_data': '{"codeActions": [{"description":"", "changes": []}]}'
+  \})
+  AssertEqual g:handle_code_action_called, 2
+
+Execute(ale#code_action#HandleCodeAction should not be called when when source is not ALE):
+  call MockHandleCodeAction()
+  let b:ale_completion_info = {'source': 'syntastic'}
+  call ale#completion#HandleUserData({
+  \  'user_data': '{"codeActions": [{"description":"", "changes": []}]}'
+  \})
+  AssertEqual g:handle_code_action_called, 0