feat(rust): add self_parameter query (#599)

Author: onsatoci

queries/rust/textobjects.scm

@@ -213,6 +213,19 @@
 (block_comment) @comment.outer
 
 ; parameter
+((parameters
+  "," @_start
+  .
+  (self_parameter) @parameter.inner)
+  (#make-range! "parameter.outer" @_start @parameter.inner))
+
+((parameters
+  .
+  (self_parameter) @parameter.inner
+  .
+  ","? @_end)
+  (#make-range! "parameter.outer" @parameter.inner @_end))
+
 ((parameters
   "," @_start
   .