feat(groq): add parser and queries (#8008)

runtime/queries/groq/folds.scm

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+[
+  (object)
+  (projection)
+  (array)
+] @fold

runtime/queries/groq/highlights.scm

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+; Keywords
+[
+  "select"
+  "asc"
+  "desc"
+] @keyword
+
+[
+  "in"
+  "match"
+] @keyword.operator
+
+; Operators
+[
+  "=="
+  "!="
+  ">"
+  ">="
+  "<"
+  "<="
+  "&&"
+  "||"
+  "!"
+  "+"
+  "-"
+  "*"
+  "/"
+  "%"
+  "**"
+  ".."
+  "..."
+  "=>"
+  "->"
+  "|"
+] @operator
+
+; Punctuation
+[
+  "("
+  ")"
+  "["
+  "]"
+  "{"
+  "}"
+] @punctuation.bracket
+
+[
+  ","
+  ":"
+  "."
+] @punctuation.delimiter
+
+; Literals
+(string) @string
+
+(number) @number
+
+[
+  (true)
+  (false)
+] @boolean
+
+; Special references
+[
+  (null)
+  (star)
+  (parent)
+  (this)
+] @constant.builtin
+
+; Identifiers
+(identifier) @variable
+
+; Parameters
+(parameter
+  "$" @variable.parameter
+  (identifier) @variable.parameter)
+
+; Function calls
+(function_call
+  (identifier) @function)
+
+(order_function
+  "order" @function.builtin)
+
+; Comments
+(comment) @comment @spell
+
+; String keys in projections/objects
+(pair
+  (literal
+    (string) @property))
+
+; Highlight field names in projections
+(projection
+  (identifier) @property)
+
+; Built-in functions (essential GROQ functions)
+(function_call
+  (identifier) @function.builtin
+  (#any-of? @function.builtin
+    "count" "length" "defined" "references" "now" "dateTime" "coalesce" "unique" "max" "min" "sum"
+    "avg" "round" "floor" "ceil" "abs" "sqrt" "upper" "lower" "string" "number" "boolean" "array"
+    "object" "type" "global" "sanity" "path" "delta" "after" "before"))

runtime/queries/groq/indents.scm

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+[
+  (object)
+  (projection)
+] @indent.begin
+
+[
+  "{"
+  "}"
+] @indent.branch
+
+"}" @indent.end

runtime/queries/groq/injections.scm

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+((comment) @injection.content
+  (#set! injection.language "comment"))