Adding a field member_function to the ASR node Struct

[tanay-man]

diff --git a/src/libasr/ASR.asdl b/src/libasr/ASR.asdl
index 1d4cf6ee7..6b56fba34 100644
--- a/src/libasr/ASR.asdl
+++ b/src/libasr/ASR.asdl
@@ -15,7 +15,7 @@ symbol
     | GenericProcedure(symbol_table parent_symtab, identifier name, symbol* procs, access access)
     | CustomOperator(symbol_table parent_symtab, identifier name, symbol* procs, access access)
     | ExternalSymbol(symbol_table parent_symtab, identifier name, symbol external, identifier module_name, identifier* scope_names, identifier original_name, access access)
-    | Struct(symbol_table symtab, identifier name, identifier* dependencies, identifier* members, abi abi, access access, bool is_packed, bool is_abstract, call_arg* initializers, expr? alignment, symbol? parent)
+    | Struct(symbol_table symtab, identifier name, identifier* dependencies, identifier* members, identifier* member_functions, abi abi, access access, bool is_packed, bool is_abstract, call_arg* initializers, expr? alignment, symbol? parent)
     | EnumType(symbol_table symtab, identifier name, identifier* dependencies, identifier* members, abi abi, access access, enumtype enum_value_type, ttype type, symbol? parent)
     | UnionType(symbol_table symtab, identifier name, identifier* dependencies, identifier* members, abi abi, access access, call_arg* initializers, symbol? parent)
     | Variable(symbol_table parent_symtab, identifier name, identifier* dependencies, intent intent, expr? symbolic_value, expr? value, storage_type storage, ttype type, symbol? type_declaration, abi abi, access access, presence presence, bool value_attr)