fix(typeahead): add typing for typeahead source data

[IraErshova]

Add typing for typeahead source data

Please merge only after this PR #5646

• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated tests.
• added/updated API documentation.
• added/updated demos.

[codecov]

Codecov Report

Merging #5647 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5647   +/-   ##
============================================
  Coverage        52.52%   52.52%           
============================================
  Files                3        3           
  Lines               99       99           
  Branches            17       17           
============================================
  Hits                52       52           
  Misses              37       37           
  Partials            10       10

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[dmitry-zhemchugov]

Needs change name of Demo like in the previous PR: #5646

[daniloff200]

@dmitry-zhemchugov this PR was based on branch from 5646, so, as soon, as 5646 will be merged, conflicts will be resolved, and everything will be the same