chore: Mark DynamoDB's templating logic experimental and add a TODO

[achals]

Signed-off-by: Achal Shah achals@gmail.com

What this PR does / why we need it:

Links this code to #2438.

Which issue(s) this PR fixes:

Fixes #

[felixwang9817]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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

[codecov-commenter]

Codecov Report

Merging #2439 (3def13e) into master (5e6d9bc) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2439      +/-   ##
==========================================
- Coverage   83.51%   83.47%   -0.04%     
==========================================
  Files         123      123              
  Lines       10762    10762              
==========================================
- Hits         8988     8984       -4     
- Misses       1774     1778       +4     

Flag	Coverage Δ
integrationtests	72.92% <ø> (-0.32%)	⬇️
unittests	57.49% <ø> (ø)

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

Impacted Files	Coverage Δ
sdk/python/feast/infra/online_stores/dynamodb.py	86.33% <ø> (ø)
sdk/python/feast/wait.py	58.82% <0.00%> (-35.30%)	⬇️
.../integration/online_store/test_universal_online.py	70.82% <0.00%> (-0.48%)	⬇️
...python/feast/infra/offline_stores/offline_store.py	83.33% <0.00%> (ø)
sdk/python/feast/infra/online_stores/datastore.py	90.52% <0.00%> (+1.89%)	⬆️

---

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 5e6d9bc...3def13e. Read the comment docs.