vscode-json-languageserver support (#4164)

* vscode-json-languageserver-bin support

VSCode JSON languageserver has schema support for linting and
completions.

I have enabled snippets support (`snippetSupport`) even if it is not
fully supported. `label` that comes with completions response can be
used as well.

* Test fix.

* vscode-json-languageserver instead of vscode-json-languageserver-bin

vscode-json-languageserver is more up-to-date (about 1 year old),
vscode-json-languageserver-bin is 4 years old.

* Use git root.

* Documentation update.

* Trying to sort ordering issue.

* One more attempt

* One more attempt

* Uppercase seems to win.

* Clean-up

* Clean-up 2

* Test removed.

doc/ale-json.txt

@@ -153,6 +153,18 @@ g:ale_json_spectral_use_global                 *g:ale_json_spectral_use_global*
 
   See |ale-integrations-local-executables|
 
+===============================================================================
+vscodejson                                                    *ale-json-vscode*
+
+Website: https://www.npmjs.com/package/vscode-json-languageserver
+
+Installation
+-------------------------------------------------------------------------------
+
+Install VSCode json language server either globally or locally: >
+
+  npm install -g vscode-json-languageserver
+<
 
 ===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale-supported-languages-and-tools.txt

@@ -283,6 +283,7 @@ Notes:
   * `tsserver`
   * `xo`
 * JSON
+  * `VSCode JSON language server`
   * `cspell`
   * `dprint`
   * `eslint`

doc/ale.txt

@@ -1613,6 +1613,7 @@ g:ale_linters                                                   *g:ale_linters*
   \   'help': [],
   \   'inko': ['inko'],
   \   'json': ['jsonlint', 'spectral'],
+  \   'json': ['jsonlint', 'spectral', 'vscodejson'],
   \   'json5': [],
   \   'jsonc': [],
   \   'perl': ['perlcritic'],
@@ -2961,6 +2962,7 @@ documented in additional help files.
     jq....................................|ale-json-jq|
     prettier..............................|ale-json-prettier|
     spectral..............................|ale-json-spectral|
+    vscodejson............................|ale-json-vscode|
   jsonc...................................|ale-jsonc-options|
     eslint................................|ale-jsonc-eslint|
   jsonnet.................................|ale-jsonnet-options|