Support TDIGEST.MERGESTORE and make compression optional on TDIGEST.CREATE

[dvora-h]

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

closes #2309

[codecov-commenter]

Codecov Report

Merging #2319 (cca1c95) into master (9901c79) will decrease coverage by 0.00%.
The diff coverage is 96.55%.

@@            Coverage Diff             @@
##           master    #2319      +/-   ##
==========================================
- Coverage   92.15%   92.15%   -0.01%     
==========================================
  Files         111      111              
  Lines       28659    28687      +28     
==========================================
+ Hits        26412    26437      +25     
- Misses       2247     2250       +3     

Impacted Files	Coverage Δ
redis/commands/bf/commands.py	98.35% <85.71%> (-0.52%)	⬇️
tests/test_asyncio/test_bloom.py	99.57% <100.00%> (+0.02%)	⬆️
tests/test_bloom.py	99.59% <100.00%> (+0.01%)	⬆️
tests/conftest.py	84.94% <0.00%> (-0.78%)	⬇️
tests/test_cluster.py	96.85% <0.00%> (-0.12%)	⬇️
tests/test_asyncio/test_search.py	98.67% <0.00%> (+0.33%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us.