Remove tensorflow-metadata folders

[casassg]

Instead of sourcing tensorflow-metadata files in the sdk, we add a dependency on tensorflow-metadata library.

Currently feast python adds tensorflow_metadata namespace. This causes pip to overwrite the tensorflow-metadata library if installed after.

So instead of doing this, we can just add a dependency on tensorflow-metadata.

This PR is a proposal to fix the issue detected in #2035

Switch to use tensorflow-metadata requirement instead of sourcing compiled tensorflow-metadata in the sdk.

[feast-ci-bot]

Hi @casassg. Thanks for your PR.

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[woop]

Thanks @casassg!

[codecov-commenter]

Codecov Report

Merging #2038 (366b2fc) into master (d0a7863) will increase coverage by 23.40%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2038       +/-   ##
===========================================
+ Coverage   60.01%   83.42%   +23.40%     
===========================================
  Files         103      100        -3     
  Lines        8523     8028      -495     
===========================================
+ Hits         5115     6697     +1582     
+ Misses       3408     1331     -2077     

Flag	Coverage Δ
integrationtests	74.17% <ø> (?)
unittests	57.54% <ø> (-2.47%)	⬇️

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

Impacted Files	Coverage Δ
sdk/python/feast/online_response.py	87.71% <0.00%> (+1.75%)	⬆️
sdk/python/feast/infra/online_stores/sqlite.py	96.77% <0.00%> (+2.15%)	⬆️
sdk/python/feast/feature.py	72.72% <0.00%> (+3.03%)	⬆️
sdk/python/feast/infra/provider.py	91.73% <0.00%> (+4.95%)	⬆️
sdk/python/feast/errors.py	70.00% <0.00%> (+5.00%)	⬆️
sdk/python/feast/data_source.py	61.29% <0.00%> (+6.45%)	⬆️
sdk/python/feast/infra/offline_stores/file.py	96.80% <0.00%> (+8.00%)	⬆️
sdk/python/feast/feature_view.py	88.05% <0.00%> (+10.69%)	⬆️
sdk/python/feast/infra/passthrough_provider.py	100.00% <0.00%> (+11.11%)	⬆️
sdk/python/feast/repo_config.py	87.00% <0.00%> (+11.86%)	⬆️
... and 49 more

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[casassg]

(rebased for signoff)

[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[achals]

/kind housekeeping

[casassg]

(is there a schedule for when this may be released? Mostly want to use this for tfx-addons project :D )

[achals]

@casassg @adchia can comment but I believe we're planning on cutting a new release in a the coming couple of weeks.

[casassg]

Sg! Will wait for confirmation. Would be nice otherwise if we can backport this to 0.15 as a patch release given that this is mostly a "bug" fix (I understand it's not, but it should not modify behaviour as it effectively should be the same)

[adchia]

There's likely some patch release we could sneak in relatively soon since we do have several issues we want to resolve.