[NEW] Chatpal: Search for uploaded files

[Peym4n]

Closes #13888

This PR contains the implementation of file details/content search as described in the issue. Note: This feature is not enabled in the open-source version of Chatpal-API. But the hosted version is free during beta.

Here are some screenshots:

New default results type option in settings:

I will now handover this project to @tkurz. Any required changes will be done by him.

[ruKurz]

@tkurz could you please give an update to this PR? @Peym4n you need to sign the license/cla, before this will be merged. @engelgabriel this PR enables to search within attachments, would be great to see this merged!

[Peym4n]

I signed the CLA now, but somehow it doesn't show up here.

[ccfiel]

Hello. When this be merge? :)

[ccfiel]

@tkurz any chance that would this be updated? :)

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

:white_check_mark: tkurz
:x: Peyman Aparviz

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