Add pagination for submissions

[Koc]

This PR adds pagination for submissions list page. Few notes about implementation:

• It's not affect "Summary" tab
• Pagination works on the server
• There is an extra "search" field that used for filtering submissions

🔍 Preview

[Chartman123]

Hi @Koc

nice start, here are a few comments:

• I think we should split up the filtering from the rest of the pagination block and move it up to the right of the summary/responses switch
  
• The page dropdown is placed too high, there should be more spacing on top of it
• floating style looks odd to me, should be just embedded into the page
• page selection should be below the submissions or above and below but not only above them.
• A max of 50 items seems too big for me as a default. You'd still have to scroll a lot before you reach the end of the page
• At best we should make the item limit configurable (user setting)

Regarding the pagination in general: I think we should only fetch the currently shown submissions from the API. But in this case the filtering will no longer be able to work only in the front-end. So more adjustments needed then...

[Koc]

Hey @Chartman123 , thank you for quick feedback, very appreciated!

I've did some changes and updated screenshots in the PR description. So, I've moved pagination to backend and added extra parameter for full text search. For some reason it not works for me 😕 . Please help, feel free to push.

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 35 lines in your changes missing coverage. Please review.

Project coverage is 42.45%. Comparing base (e88ba60) to head (2bcdcd2).
Report is 12 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2710      +/-   ##
============================================
- Coverage     43.55%   42.45%   -1.11%     
- Complexity      908      912       +4     
============================================
  Files            78       78              
  Lines          3391     3373      -18     
============================================
- Hits           1477     1432      -45     
- Misses         1914     1941      +27     

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