fix(codegen): handle nullable for date type

[aceforeverd]

Also fix include headers as iwyu.

Fixes #3194

More general problem is described in #926, which should handling later

always returns allocated structure even it is null, for the cases:

1. construct timestamp from number, even number is < 0
2. construct date from timestamp, even timestamp is null
3. construct date from null literal

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (bcc0b1f) 75.33% compared to head (757717a) 75.32%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3543      +/-   ##
============================================
- Coverage     75.33%   75.32%   -0.01%     
  Complexity      587      587              
============================================
  Files           716      716              
  Lines        129651   129654       +3     
  Branches       1280     1280              
============================================
- Hits          97672    97665       -7     
- Misses        31693    31703      +10     
  Partials        286      286              

Files	Coverage Δ
hybridse/src/codegen/array_ir_builder.cc	100.00% <ø> (ø)
hybridse/src/codegen/cast_expr_ir_builder.cc	68.28% <100.00%> (+0.56%)	⬆️
hybridse/src/codegen/date_ir_builder.cc	68.93% <100.00%> (+0.72%)	⬆️
hybridse/src/codegen/ir_base_builder.h	100.00% <ø> (ø)
hybridse/src/codegen/native_value.cc	74.35% <ø> (ø)
hybridse/src/codegen/predicate_expr_ir_builder.cc	74.88% <ø> (ø)
hybridse/src/codegen/type_ir_builder.cc	82.53% <ø> (ø)
hybridse/src/codegen/type_ir_builder.h	100.00% <ø> (ø)
hybridse/src/codegen/udf_ir_builder.cc	80.48% <100.00%> (ø)
hybridse/src/codegen/udf_ir_builder.h	100.00% <ø> (ø)
... and 4 more

... and 15 files with indirect coverage changes

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