starrocks [Enhancement] `files()` `csv.trim

Why I'm doing:

The csv.trim_space property of files() should be in bool type. Now, the files() will not report any error even if we set csv.trim_space as any illegal string a.

What I'm doing:

This PR fixes this issue. When an illegal values is set, Access storage error. Error message: illegal value of csv.skip_header: a, only true/false allowed will be reported. Fixes https://github.com/StarRocks/starrocks/issues/42800

What type of PR is this:

[x] BugFix
[ ] Feature
[ ] Enhancement
[ ] Refactor
[ ] UT
[ ] Doc
[ ] Tool

Does this PR entail a change in behavior?

[ ] Yes, this PR will result in a change in behavior.
[x] No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

[ ] Interface/UI changes: syntax, type conversion, expression evaluation, display information
[ ] Parameter changes: default values, similar parameters but with different default values
[ ] Policy changes: use new policy to replace old one, functionality automatically enabled
[ ] Feature removed
[ ] Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

[x] I have added test cases for my bug fix or my new feature
[ ] This pr needs user documentation (for new or modified features or behaviors)
- [ ] I have added documentation for my new feature or new function
[ ] This is a backport pr