feat: add help-urls

[kyrylo-kh]

Added utilities for fetching documentation urls from backend.
Backend PR: openedx/edx-platform#33073

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[codecov]

Codecov Report

Patch coverage: 11.11% and project coverage change: -0.25% ⚠️

Comparison is base (e50b8c7) 84.80% compared to head (1bf4f86) 84.55%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #585      +/-   ##
==========================================
- Coverage   84.80%   84.55%   -0.25%     
==========================================
  Files         302      307       +5     
  Lines        4897     4993      +96     
  Branches     1086     1102      +16     
==========================================
+ Hits         4153     4222      +69     
- Misses        721      747      +26     
- Partials       23       24       +1     

Files Changed	Coverage Δ
src/help-urls/data/api.js	0.00% <0.00%> (ø)
src/help-urls/data/selectors.js	0.00% <0.00%> (ø)
src/help-urls/data/thunks.js	0.00% <0.00%> (ø)
src/help-urls/hooks.jsx	0.00% <0.00%> (ø)
src/store.js	100.00% <ø> (ø)
src/help-urls/data/slice.js	50.00% <50.00%> (ø)

... and 12 files with indirect coverage changes

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[openedx-webhooks]

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