feat(round): supports decimal place as second parameter

[aceforeverd]

Follows the defs in Transact-SQL or SparkSQL.

KeyPoints

• decimal place can be positive, 0 or negative, indicating the position to decimal point (after, 0, before)
• return type is same as the first parameter. E.g round(double, ..) -> double, round(int, ..) -> int
• second parameter can be omitted, default to zero, for backwards compatibility

[codecov]

Codecov Report

Patch coverage: 82.53% and project coverage change: -3.43 ⚠️

Comparison is base (18710bf) 79.02% compared to head (36f1d58) 75.60%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3221      +/-   ##
============================================
- Coverage     79.02%   75.60%   -3.43%     
- Complexity        0      393     +393     
============================================
  Files           517      678     +161     
  Lines        115991   125425    +9434     
  Branches          0     1180    +1180     
============================================
+ Hits          91662    94827    +3165     
- Misses        24313    30362    +6049     
- Partials         16      236     +220     

Impacted Files	Coverage Δ
hybridse/src/udf/default_udf_library.cc	96.98% <72.72%> (-0.28%)	⬇️
hybridse/src/codegen/udf_ir_builder_test.cc	98.83% <82.60%> (-0.77%)	⬇️
hybridse/src/udf/udf.h	98.52% <100.00%> (+0.09%)	⬆️

... and 172 files with indirect coverage changes

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