feat: Add DateFieldExtractStyle::Strftime support for SqliteDialect unparser

[peasee]

Which issue does this PR close?

Closes #12160

Rationale for this change

• In SQLite, the only way to extract date information is through strftime. The unparser needs to be updated to support strftime, as any other scalar function results in SQLite query errors.

What changes are included in this PR?

• Changes the default DateFieldExtractStyle for SQLite to Strftime
• Implements the unparser for DateFieldExtractStyle::Strftime to use strftime instead of date_part

Are these changes tested?

Yes

Are there any user-facing changes?

No?

[devinjdangelo]

Thank you @peasee this looks good to me! I can't approve the pipelines to run, but I did check this out locally and manually ran some checks (all of which passed).

@alamb could you kick off the github actions for this one?

[alamb]

Thank you @peasee this looks good to me! I can't approve the pipelines to run, but I did check this out locally and manually ran some checks (all of which passed).

@alamb could you kick off the github actions for this one?

Thanks @devinjdangelo -- sorry for the delay, I was out last week and am catching up

[alamb]

The code looks good to me too -- thank you @peasee and @devinjdangelo