enhance UDF name validation

[lizhou1111]

When you create a UDA funtion like below:

CREATE OR REPLACE AGGREGATE FUNCTION group_distinct(value string)
RETURNS array(string)
LANGUAGE JAVASCRIPT AS $$
....
$$;

Proton won't recognize is as aggregation function, the reason is in this code .Because the _distinct is key word suffix.
The other key word suffixes are below:

• _distinct_streaming
• _distinct_retract
• _sample_state
• _or_default
• _distinct
• _resample
• _for_each
• _or_null
• _merge
• _state
• _array
• _null
• _map
• _if
  this closes Unknown function exception for a UDA #479