feat: Add support for unix_timestamp function

[andygrove]

Which issue does this PR close?

Closes #.

Rationale for this change

What changes are included in this PR?

• Add support for unix_timestamp for timestamp and date inputs
• Move all temoral expression serde into expression registry

How are these changes tested?

Benchmarks

Performance is not great:

OpenJDK 64-Bit Server VM 11.0.22+7-LTS on Mac OS X 14.6.1
Apple M3 Max
Unix Timestamp from Timestamp (UTC):          Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
----------------------------------------------------------------------------------------------------------------------------
Unix Timestamp from Timestamp (UTC) - Spark              31             46          11         34.3          29.1       1.0X
Unix Timestamp from Timestamp (UTC) - Comet              37             55          13         28.7          34.9       0.8X

OpenJDK 64-Bit Server VM 11.0.22+7-LTS on Mac OS X 14.6.1
Apple M3 Max
Unix Timestamp from Date (UTC):           Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Unix Timestamp from Date (UTC) - Spark               43             58          14         24.6          40.6       1.0X
Unix Timestamp from Date (UTC) - Comet               31             47          17         34.2          29.2       1.4X

OpenJDK 64-Bit Server VM 11.0.22+7-LTS on Mac OS X 14.6.1
Apple M3 Max
Unix Timestamp from Timestamp (America/Los_Angeles):          Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
--------------------------------------------------------------------------------------------------------------------------------------------
Unix Timestamp from Timestamp (America/Los_Angeles) - Spark              27             51          18         39.4          25.4       1.0X
Unix Timestamp from Timestamp (America/Los_Angeles) - Comet              33             54          13         31.6          31.6       0.8X

OpenJDK 64-Bit Server VM 11.0.22+7-LTS on Mac OS X 14.6.1
Apple M3 Max
Unix Timestamp from Date (America/Los_Angeles):          Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
---------------------------------------------------------------------------------------------------------------------------------------
Unix Timestamp from Date (America/Los_Angeles) - Spark              58             84          19         18.0          55.6       1.0X
Unix Timestamp from Date (America/Los_Angeles) - Comet              61             79          15         17.3          57.7       1.0X

[codecov-commenter]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.61%. Comparing base (f09f8af) to head (d7ffc2e).
⚠️ Report is 783 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/main/scala/org/apache/comet/serde/datetime.scala	75.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2936      +/-   ##
============================================
+ Coverage     56.12%   59.61%   +3.48%     
- Complexity      976     1381     +405     
============================================
  Files           119      167      +48     
  Lines         11743    15506    +3763     
  Branches       2251     2569     +318     
============================================
+ Hits           6591     9244    +2653     
- Misses         4012     4961     +949     
- Partials       1140     1301     +161     

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