[Feature]Add toMonth date function

[GrapeBaBa]

Signed-off-by: grapebaba 281165273@qq.com

I hereby agree to the terms of the CLA available at: https://databend.rs/policies/cla/

Summary

Add toMonth date function

Changelog

• New Feature

Related Issues

#853

Fixes #issue

Test Plan

Unit Tests

Stateless Tests

[databend-bot]

Thanks for the contribution!
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[codecov-commenter]

Codecov Report

Merging #2042 (7d707d7) into master (365432c) will increase coverage by 0%.
The diff coverage is 96%.

@@           Coverage Diff           @@
##           master   #2042    +/-   ##
=======================================
  Coverage      68%     68%            
=======================================
  Files         650     653     +3     
  Lines       36538   36759   +221     
=======================================
+ Hits        25132   25328   +196     
- Misses      11406   11431    +25     

Impacted Files	Coverage Δ
...mon/functions/src/scalars/dates/number_function.rs	52% <60%> (+<1%)	⬆️
common/functions/src/scalars/dates/date.rs	43% <100%> (+<1%)	⬆️
.../functions/src/scalars/dates/date_function_test.rs	98% <100%> (+<1%)	⬆️
dfs/src/api/http_service.rs	14% <0%> (-62%)	⬇️
kvsrv/src/api/http_service.rs	14% <0%> (-62%)	⬇️
dfs/src/api/http_service_test.rs	64% <0%> (-4%)	⬇️
kvsrv/src/api/http_service_test.rs	64% <0%> (-4%)	⬇️
common/kv/src/kv.rs	91% <0%> (-3%)	⬇️
query/src/common/mod.rs	83% <0%> (-3%)	⬇️
common/management/src/namespace/namespace_mgr.rs	70% <0%> (-3%)	⬇️
... and 16 more

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[zhang2014]

/LGTM @GrapeBaBa Thank you contribution

[databend-bot]

Approved! Thank you for the PR @GrapeBaBa

[databend-bot]

CI Passed
Reviewer Approved
Let's Merge