feat: add python context queries

Add context queries for the sticky-context feature, so python classes
and functions show up as well

runtime/queries/python/context.scm

@@ -0,0 +1,15 @@
+(function_definition
+  _ parameters: (_) @context.params
+) @context
+
+(class_definition) @context
+
+[
+  (if_statement)
+  (for_statement)
+  (while_statement)
+  (with_statement)
+  (try_statement)
+  (match_statement)
+  (case_clause)
+] @context