fix to be able to query with both alias and identifier

[daddaman-amz]

If the fields has an alias and user tries to query with original identifier we throw an error.

RL behavior silently gives zero results for same case:

127.0.0.1:6379> FT.CREATE idx2 ON HASH SCHEMA content as con TEXT NOSTEM category as cat TAG price as pr NUMERIC
OK
127.0.0.1:6379> ft.search idx2 @con:"smart" dialect 2
1) (integer) 1
127.0.0.1:6379> ft.search idx2 @content:"smart" dialect 2
1) (integer) 0
127.0.0.1:6379> ft.search idx2 @cat:{test} dialect 2
1) (integer) 1
127.0.0.1:6379> ft.search idx2 @category:{test} dialect 2
1) (integer) 0

Ideal behavior would be to handle both cases from a query which this PR does

[daddaman-amz]

Used by filter_parser.cc for numeric, tags

ParseNumericPredicate
ParseTagPredicate

[daddaman-amz]

Used in PreParseQueryString (search.cc)