Add Include Ignored Toggle to File Finder and implement support for SearchOption flags on other Pickers

[solventak]

Closes #4745

Add support to include ignored for the file finder. As a side product, all other picker delegates have the initial seeds planted for adding search options later, if requested or needed.

Open to any and all feedback. New contributor.

Release Notes:

Added (#4745 ).

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[solventak]

Updated email.

[SomeoneToIgnore]

Thank you for an attempt, the inner icon approach looks like one of the good ways to explore for sure, but this alone cannot close #4745 despite stating that.

I've posted a long description in the issue:
#4745 (comment)
what's related to this approach: using the new icon would not show any gitignored files inside directories what were never expanded before:

and adding all gitignored files inside current Zed caches is hard, if possible at all.

I think before adding the toggle, we need to somehow approach the "actually look up all gitignored files we want" issue first, and then come back here (or with another approach if the toggle would not work).

[SomeoneToIgnore]

I will close this, as it's inactive for a while and needs a totally different change first to make this PR to work properly and show matches over all ignored files.

Thank you for an attempt nonetheless: that button in the input looks like a nice thing to add into a few our pickers, it was great to play with it implemented.