Add HEEx language support, add missing commentstrings

queries/heex/folds.scm

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+; HEEx folds similar to HTML
+[
+  (tag)
+  (component)
+] @fold

queries/heex/highlights.scm

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+; HEEx text is highlighted as such
+(text) @text
+
+; HEEx has two types of comments, both are highlighted as such
+(comment) @comment
+
+; HEEx attributes are highlighted as HTML attributes
+(attribute_name) @tag.attribute
+
+; Attributes are highlighted as strings
+(quoted_attribute_value) @string
+
+; HEEx supports HTML tags and are highlighted as such
+[
+  "<"
+  ">"
+  "</"
+  "/>"
+  "<%"
+  "<%="
+  "<%%="
+  "<%#"
+  "%>"
+  "{"
+  "}"
+] @tag.delimiter
+
+; HEEx tags are highlighted as HTML
+(tag_name) @tag
+
+; HEEx components are highlighted as types (Elixir modules)
+(component_name) @type
+
+; HEEx operators
+["="] @operator

queries/heex/indents.scm

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+; HEEx  indents like HTML
+[
+  (component)
+  (tag)
+] @indent
+
+; Dedent at the end of each tag
+[
+  (end_tag)
+  (end_component)
+] @branch

queries/heex/injections.scm

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+; Directives are combined to support do blocks
+(directive (expression_value) @elixir @combined)
+
+; Expressions are not combined, as they exist separately from do blocks
+(expression (expression_value) @elixir)
+
+(comment) @comment