Add a new dialect hook 'materializeConstant' to create a constant operation...

Add a new dialect hook 'materializeConstant' to create a constant operation that materializes an attribute value with the given type. This effectively adds support for dialect specific constant values that have different invariants than std.constant. 'OperationFolder' is updated to use this new hook, or attempt to default to std.constant when legal.

PiperOrigin-RevId: 254570153