feat(wxml): add parser and queries

runtime/queries/wxml/folds.scm

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+[
+  (element)
+  (block_element)
+  (slot_element)
+  (template_element)
+  (wxs_element)
+] @fold

runtime/queries/wxml/highlights.scm

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+; Comments
+(comment) @comment @spell
+
+; Text
+(text) @spell
+
+; Tag names
+(tag_name) @tag
+
+((tag_name) @tag.builtin
+  (#any-of? @tag.builtin "wxs" "template" "import" "include" "slot" "block"))
+
+; Attributes
+(attribute_name) @tag.attribute
+
+(attribute_value) @string
+
+(quoted_attribute_value) @string
+
+; WeChat specific attributes
+((attribute_name) @keyword.directive
+  (#lua-match? @keyword.directive "^wx:"))
+
+((attribute_name) @keyword.conditional
+  (#any-of? @keyword.conditional "wx:if" "wx:elif" "wx:else"))
+
+((attribute_name) @keyword.repeat
+  (#any-of? @keyword.repeat "wx:for" "wx:for-index" "wx:for-item"))
+
+((attribute_name) @keyword
+  (#lua-match? @keyword "^bind"))
+
+((attribute_name) @keyword
+  (#lua-match? @keyword "^catch"))
+
+((attribute_name) @keyword
+  (#lua-match? @keyword "^mut%-bind"))
+
+((attribute_name) @keyword
+  (#lua-match? @keyword "^model:"))
+
+((attribute_name) @keyword
+  (#lua-match? @keyword "^data-"))
+
+((attribute
+  (attribute_name) @_attr
+  (quoted_attribute_value) @string.special.url)
+  (#any-of? @_attr "href" "src")
+  (#offset! @string.special.url 0 1 0 -1))
+
+; Entity references
+(entity) @character.special
+
+; Interpolation delimiters
+(interpolation_start) @punctuation.special
+
+(interpolation_end) @punctuation.special
+
+[
+  "<"
+  ">"
+  "</"
+  "/>"
+] @tag.delimiter
+
+"=" @operator

runtime/queries/wxml/indents.scm

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+; inherits: html_tags
+
+(block_element) @indent.begin
+
+(template_element) @indent.begin
+
+(wxs_element) @indent.begin
+
+(block_element
+  (block_end_tag
+    ">" @indent.end))
+
+(template_element
+  (template_end_tag
+    ">" @indent.end))
+
+(wxs_element
+  (wxs_end_tag
+    ">" @indent.end))
+
+(block_element
+  (block_end_tag) @indent.branch)
+
+(template_element
+  (template_end_tag) @indent.branch)
+
+(wxs_element
+  (wxs_end_tag) @indent.branch)
+
+(import_statement) @indent.ignore
+
+(include_statement) @indent.ignore

runtime/queries/wxml/injections.scm

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+((comment) @injection.content
+  (#set! injection.language "comment"))
+
+((raw_text) @injection.content
+  (#set! injection.language "javascript")
+  (#set! injection.include-children))
+
+((expression) @injection.content
+  (#set! injection.language "javascript")
+  (#set! injection.include-children))