feat(functions): migrate trim functions to new expression framework.

[RinChanNOWWW]

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

Summary

Migreate trim functions to new expression framework:

• ltrim
• rtrim
• trim
• trim_both
• trim_leading
• trim_trailing

P.S. trim will be transformed into trim_both or trim_leading or trim_trailing, but the transformation is only implemented for unit test now.

Fixes #6766

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1 Ignored Deployment

Name	Status	Preview	Updated
databend	⬜️ Ignored (Inspect)		Sep 2, 2022 at 11:42AM (UTC)

[mergify]

This pull request's title is not fulfill the requirements. @RinChanNOWWW please update it 🙏.

Valid format:

fix(query): fix group by string bug
  ^         ^---------------------^
  |         |
  |         +-> Summary in present tense.
  |
  +-------> Type: feat, fix, refactor, ci, build, docs, website, chore

Valid types:

• feat: this PR introduces a new feature to the codebase
• fix: this PR patches a bug in codebase
• refactor: this PR changes the code base without new features or bugfix
• ci|build: this PR changes build/testing/ci steps
• docs|website: this PR changes the documents or websites
• chore: this PR only has small changes that no need to record

[RinChanNOWWW]

PTAL @andylokandy

[BohuTANG]

Conflicting files
common/functions-v2/src/scalars/string.rs
common/functions-v2/tests/it/scalars/string.rs

[RinChanNOWWW]

Conflicting files common/functions-v2/src/scalars/string.rs common/functions-v2/tests/it/scalars/string.rs

Will resolve soon.