feat: add support for TRIM()

[tkzt]

What problem does this PR solve?

Generally, according to E21_09, adds support for the method TRIM().

Issue link: #130

What is changed and how it works?

Expression matching a pattern below will work fine:

TRIM([LEADING | TRAILING | BOTH] [trim_what FROM] exp)

Code changes

• Has Rust code change
• Has CI related scripts change

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Note for reviewer

None

[KKould]

I'm surprised you actually did this, welcome to rust and database!

[KKould]

There seems to be some problems with the github action, please check it

Tips: Please use cargo fmt to format the code

[tkzt]

I'm surprised you actually did this, welcome to rust and database!

Time to move forward! 🙃

[tkzt]

Test cases updated. But one thing has to be mentioned:

An expression like SELECT TRIM ( FROM 'foo' ); seems to be invalid, from sqlparser's point of view.

[KKould]

Thank you for your contribution!