Add provider, offline store, online store, registry to RTD

[felixwang9817]

Signed-off-by: Felix Wang [email protected]

What this PR does / why we need it: Currently Feast's RTD page does not have docs for providers, offline stores, online stores, and the registry. This PR adds those docs.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #1918 (74aa2dc) into master (03c8317) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1918   +/-   ##
=======================================
  Coverage   82.97%   82.97%           
=======================================
  Files          96       96           
  Lines        7376     7376           
=======================================
  Hits         6120     6120           
  Misses       1256     1256           

Flag	Coverage Δ
integrationtests	74.41% <ø> (ø)
unittests	60.64% <ø> (ø)

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[felixwang9817]

/kind housekeeping

[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: achals, felixwang9817

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