presto-pinot: COALESCE translation and pushdown

[cliandy]

Building upon Presto switch statement pushdown to Pinot. Supporting COALESCE for filter predicates via translation to CASE statement.

Test plan

• Unit Tests

== RELEASE NOTES ==

Pinot Changes
* support for some projection functions and if statements
* AST peek for support projections not supported currently in Pinot

Follow up to this PR after accidentally closed: https://github.com/prestodb/presto/pull/17957

[cliandy]

@ajaygeorge this is the updated one from the other PR accidentally closed, could you take a look? Thanks

[cliandy]

@highker could you take a look at this?