feat: add vhdl parser and queries

queries/vhdl/folds.scm

@@ -0,0 +1,46 @@
+[
+  (block_comment)
+  (architecture_definition)
+  (architecture_head)
+  (concurrent_block)
+  (configuration_declaration)
+  (component_instantiation_statement)
+  (generic_map_aspect)
+  (port_map_aspect)
+  (process_statement)
+  (process_head)
+  (sequential_block)
+  (block_configuration)
+  (block_statement)
+  (block_head)
+  (component_declaration)
+  (component_configuration)
+  (generic_clause)
+  (port_clause)
+  (entity_declaration)
+  (entity_head)
+  (entity_body)
+  (package_declaration)
+  (package_definition)
+  (function_specification)
+  (subprogram_declaration)
+  (subprogram_definition)
+  (subprogram_head)
+  (procedure_specification)
+  (sequential_block)
+  (loop_statement)
+  (if_statement_block)
+  (if_statement)
+  (elsif_statement)
+  (else_statement)
+  (case_statement)
+  (case_statement_alternative)
+  (for_generate_statement)
+  (if_generate_statement)
+  (if_generate)
+  (elsif_generate)
+  (else_generate)
+  (case_generate_statement)
+  (case_generate_alternative)
+  (type_declaration)
+] @fold