feat: add http parser

All credit goes to @NTBBloodbath.

See: https://github.com/NTBBloodbath/rest.nvim/issues/75#issuecomment-960447966

Co-authored-by: NTBBloodbath <bloodbathalchemist@protonmail.com>

queries/http/highlights.scm

@@ -0,0 +1,33 @@
+; Display errors
+(ERROR) @error
+
+; Comments
+(comment) @comment
+
+(request
+  method: (method) @keyword
+  url: (url) @TSURI)
+
+(header
+  name: (name) @constant
+  value: (value))
+
+; JSON
+(json_pair
+  key: (_) @keyword)
+
+(json_string) @string
+
+(json_number) @number
+
+(json_boolean) @boolean
+
+(json_null) @constant
+
+(json_escape_sequence) @TSStringEscape
+
+(json_body) @keyword
+
+; rest.nvim Neovim plugin specific features
+(external_body
+  json_file: (json_file) @TSURI) @keyword