Fix uniqueness of macroable objects on grammars #26461
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In my pr #24513 i added the macroable trait to the grammars outermost parent class.
But what i didn't realize is that if one where to try to register the same macro name into two different grammars only the last call to the macro method will be used sense the macro property is static and lives in the outmost parent.
So every call to macro would override another one.