Support map type casting for numeric type and null type element

[peterxcli]

select map_contains_key(map_from_arrays(array(1, 2), array('a', 'b')), 5.0)
  Expected only Comet native operators, but found Project.
  plan:  Project [COMET: Cast from MapType(IntegerType,StringType,false) to MapType(DecimalType(11,1),StringType,false) is not supported]
  +- Scan OneRowRelation

select map_contains_key(map_from_arrays(array(), array()), 0)
  Expected only Comet native operators, but found Project.
  plan:  Project [COMET: Cast from MapType(NullType,NullType,false) to MapType(IntegerType,NullType,false) is not supported]
  +- Scan OneRowRelation

[comphead]

Thanks @peterxcli for reporting this