Modify feature_store.plan to produce an InfraDiff

[felixwang9817]

What this PR does / why we need it: This PR modifies feature_store.plan to produce an InfraDiff object, which will be used to modify infrastructure as part of feast plan.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #2211 (87e417a) into master (97dd41e) will decrease coverage by 0.00%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #2211      +/-   ##
==========================================
- Coverage   85.04%   85.04%   -0.01%     
==========================================
  Files         105      105              
  Lines        8387     8450      +63     
==========================================
+ Hits         7133     7186      +53     
- Misses       1254     1264      +10     

Flag	Coverage Δ
integrationtests	73.08% <52.22%> (-0.52%)	⬇️
unittests	59.84% <66.66%> (+0.18%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdk/python/feast/repo_operations.py	48.37% <0.00%> (ø)
sdk/python/feast/infra/online_stores/datastore.py	89.15% <25.00%> (-2.52%)	⬇️
sdk/python/feast/infra/infra_object.py	72.13% <44.44%> (+0.39%)	⬆️
sdk/python/feast/diff/infra_diff.py	88.40% <46.15%> (-8.42%)	⬇️
sdk/python/feast/errors.py	71.01% <66.66%> (-0.10%)	⬇️
sdk/python/feast/infra/online_stores/dynamodb.py	85.61% <66.66%> (-0.42%)	⬇️
...k/python/feast/infra/online_stores/online_store.py	80.00% <75.00%> (-0.96%)	⬇️
sdk/python/feast/infra/provider.py	89.65% <75.00%> (-0.53%)	⬇️
sdk/python/feast/infra/online_stores/sqlite.py	94.48% <88.88%> (+8.04%)	⬆️
sdk/python/feast/diff/FcoDiff.py	89.09% <100.00%> (+0.62%)	⬆️
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 97dd41e...87e417a. Read the comment docs.

[adchia]

nonblocking comment: does it make sense to print a message or something here? e.g. so a custom provider knows that feast plan won't cover their use case?

Not sure how we intend the SDK version of plan to be used, so maybe it doesn't make sense to log though.

[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [adchia,felixwang9817]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment