Add linting support for all formats supported by djlint (#4920)

* Refactor djlint linter code

This patch moves the code to the `autoload` directory, so it's available
when it's needed by a specific linter. This avoids redundant code when
another format supported by djlint is added.

* Add linting support for all formats supported by djlint

So far, the `djlint` linter in ALE only supported `html`, which is only
one of several file types supported by `djlint`.

This patch adds support for the following file types:

* gohtmltmpl
* handlebars
* htmlangular
* htmldjango
* jinja
* nunjucks

* Add djlint fixer for various HTML template formats

* Supported formats:
    - html
    - htmlangular
    - htmldjango
    - jinja
    - handlebars
    - nunjucks
    - gohtmltmpl

* Add doc entries

* Add vader tests

---------

Co-authored-by: Adrian Vollmer <computerfluesterer@protonmail.com>

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

@@ -234,6 +234,8 @@ Notes:
   * `gotype`!!
   * `revive`!!
   * `staticcheck`!!
+* Go HTML Templates
+  * djlint
 * GraphQL
   * `eslint`
   * `gqlint`
@@ -247,6 +249,7 @@ Notes:
 * Haml
   * `haml-lint`
 * Handlebars
+  * djlint
   * `ember-template-lint`
 * Haskell
   * `brittany`
@@ -284,6 +287,10 @@ Notes:
   * `rustywind`
   * `tidy`
   * `write-good`
+* HTML Angular
+  * djlint
+* HTML Django
+  * djlint
 * Hurl
   * `hurlfmt`
 * Idris
@@ -321,6 +328,8 @@ Notes:
   * `standard`
   * `tsserver`
   * `xo`
+* Jinja
+  * djlint
 * JSON
   * `VSCode JSON language server`
   * `biome`
@@ -421,6 +430,8 @@ Notes:
   * `alex`
   * `proselint`
   * `write-good`
+* Nunjucks
+  * djlint
 * Objective-C
   * `ccls`
   * `clang`