feat: add search feature in schedule page

[maze-runnar]

Fixes #5822

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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[codecov]

Codecov Report

Merging #5823 (1d198b6) into development (11b6b36) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #5823      +/-   ##
===============================================
- Coverage        23.42%   23.41%   -0.02%     
===============================================
  Files              511      511              
  Lines             5468     5471       +3     
  Branches            65       65              
===============================================
  Hits              1281     1281              
- Misses            4170     4173       +3     
  Partials            17       17              

Impacted Files	Coverage Δ
app/controllers/public/sessions.js	0.00% <0.00%> (ø)
app/routes/public/sessions.js	0.00% <0.00%> (ø)

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[mariobehling]

Thank you. This position is also good.

Please fix the following:

1. When a user enters a search phrase the page jumps to the top. It should just stay where it is.
2. Add some spacing between buttons. They should not be directly connected.
   

[mariobehling]

Results of speakers are not showing up as expected, e.g. type in "Andrew". The session of Andrew Aitken should show up here: https://open-event-frontend-git-searchfeature.eventyay.now.sh/e/3dbaaa50/schedule?search=Andrew

[iamareebjamal]

Please add debounce to the query. The search should only happen after 250ms of user finishing the typing

[iamareebjamal]

For not reloading the page, we'll have to reimplement something like #4882

[mariobehling]

Page is moving to session heading when the search result appears. The page should not move.

[iamareebjamal]

@mariobehling That is another issue not introduced in this PR. The issue is raised separately here #5826

Shouldn't it be handled in another PR?

[iamareebjamal]

@mariobehling Ping

[iamareebjamal]

#5826 has been fixed in another PR, hence merging