Add datastore namespace option in configs

[tsotnet]

Signed-off-by: Tsotne Tabidze tsotne@tecton.ai

What this PR does / why we need it: Feast gcp provider used default namespace for all its operations. Here we add a new config in feature_store.yaml that overrides the namespace. For example:

project: my_repo
registry: data/registry.db
provider: gcp
online_store:
  type: datastore
  namespace: foo

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

Add `online_store->namespace` field in `feature_store.yaml` that overrides datastore namespace that gcp provider uses

[codecov-commenter]

Codecov Report

Merging #1581 (c179f88) into master (6e243b8) will increase coverage by 0.03%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master    #1581      +/-   ##
==========================================
+ Coverage   83.55%   83.59%   +0.03%     
==========================================
  Files          65       65              
  Lines        5752     5753       +1     
==========================================
+ Hits         4806     4809       +3     
+ Misses        946      944       -2     

Flag	Coverage Δ
integrationtests	83.50% <88.88%> (+<0.01%)	⬆️
unittests	77.36% <75.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
sdk/python/feast/repo_config.py	95.28% <66.66%> (+0.04%)	⬆️
sdk/python/feast/infra/gcp.py	83.87% <100.00%> (+1.61%)	⬆️
...hon/tests/test_offline_online_store_consistency.py	100.00% <100.00%> (ø)

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[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tsotnet, woop

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[woop]

/lgtm