[python/r] DataFrame resizer

[johnkerl]

Issue and/or context: As tracked on issue #2407 / [sc-51048].

Note that the intended Python and R API changes are all agreed on and finalized as described in #2407.

Changes:

While the full-generality upgrade_domain is on track for #2407, the most important special case is resizing the soma_joinid index column and leaving the others alone, if soma_joinid is an index column -- otherwise leaving it alone.

This already exists in C++ and is well-tested there. This PR simply connects it to Python/R. It's time for this, as we need:

• tests/testthat/test-soma-write-resume.R for R on [r] Make DataFrame objects shapeable at ingest #3089
• Experiment-level resizer for Python on [python] New-shape testing for tiledbsoma.io [WIP] #2964

Notes for Reviewer:

• This PR is stacked on top of [c++] Simplify internal API for dataframe-resizer #3090
• This PR isn't super-big -- 200 lines total as I write this -- nonetheless it's multi-language
  • I prefer this TBH for Python/R parity whenever possible
  • Also the commits are carefully split out, so a commit-at-a-time review may be helpful (up to you of course)

[nguyenv]

Look good on the Python side. Just one minor comment.

[johnkerl]

Thanks @nguyenv !

[mojaveazure]

LGTM from R, a few minor comments to be a bit more R-tastic but nothing major

[codecov]

Codecov Report

Attention: Patch coverage is 92.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 62.46%. Comparing base (a162dad) to head (c15a0bb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3091       +/-   ##
===========================================
- Coverage   88.98%   62.46%   -26.53%     
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  Files          45      108       +63     
  Lines        4287    13288     +9001     
  Branches        0      825      +825     
===========================================
+ Hits         3815     8301     +4486     
- Misses        472     4788     +4316     
- Partials        0      199      +199     

Flag	Coverage Δ
libtiledbsoma	49.76% <100.00%> (?)
python	89.09% <66.66%> (+0.10%)	⬆️

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

Components	Coverage Δ
python_api	89.09% <66.66%> (+0.10%)	⬆️
libtiledbsoma	48.63% <100.00%> (∅)