Feat(presto): transpile 'epoch' to '1970-01-01 00:00:00' in time-like casts

[georgesittas]

Fixes #1725

Haven't investigated much, so I'm not sure if this transformation is 100% correct; for the example in #1725 it works fine.

However, one difference is that Spark produces the following when casting 'epoch' to a timezone:

spark-sql (default)> select cast('epoch' as timestamp);
1970-01-01 02:00:00

Whereas this transformation yields the following when transpiling the above from Spark to Trino:

trino> SELECT TRY_CAST('1970-01-01 00:00:00' AS TIMESTAMP);
          _col0          
-------------------------
 1970-01-01 00:00:00.000 
(1 row)

Not sure why it produces 02:00:00 in the former case.. Maybe it's interpreting the 'epoch' using a different timezone?

[georgesittas]

I added the TEMPORAL_TYPES check to ensure correctness in the general case, although maybe we can get rid of it? Not sure what else one would want to cast 'epoch' into.