[python/r] Expose shape-related accessors to Python/R bindings

[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:

• These accessors are already implemented and unit-tested in C++
• On this PR, I expose only the language bindings as-is with minimal unit-testing -- more unit-testing to follow (including feature-flag logic) as tracked on #2407
• The _maybe_sjid_shape and _maybe_sjid_maxshape accessors will be crucial for experiment-level resize logic as on append mode, which does not yet exist in TileDB-SOMA-R (see #1630)

Notes for Reviewer:

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.43137% with 11 lines in your changes missing coverage. Please review.

Project coverage is 61.31%. Comparing base (8c4890c) to head (5312d49). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2953 +/- ## =========================================== - Coverage 89.87% 61.31% -28.57% =========================================== Files 38 93 +55 Lines 3999 12417 +8418 Branches 0 781 +781 =========================================== + Hits 3594 7613 +4019 - Misses 405 4606 +4201 - Partials 0 198 +198 ``` | [Flag](https://app.codecov.io/gh/single-cell-data/TileDB-SOMA/pull/2953/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=single-cell-data) | Coverage Δ | | |---|---|---| | [libtiledbsoma](https://app.codecov.io/gh/single-cell-data/TileDB-SOMA/pull/2953/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=single-cell-data) | `47.45% <0.00%> (?)` | | | [python](https://app.codecov.io/gh/single-cell-data/TileDB-SOMA/pull/2953/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=single-cell-data) | `90.02% <88.88%> (+0.15%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=single-cell-data#carryforward-flags-in-the-pull-request-comment) to find out more. | [Components](https://app.codecov.io/gh/single-cell-data/TileDB-SOMA/pull/2953/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=single-cell-data) | Coverage Δ | | |---|---|---| | [python_api](https://app.codecov.io/gh/single-cell-data/TileDB-SOMA/pull/2953/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=single-cell-data) | `90.02% <88.88%> (+0.15%)` | :arrow_up: | | [libtiledbsoma](https://app.codecov.io/gh/single-cell-data/TileDB-SOMA/pull/2953/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=single-cell-data) | `50.19% <0.00%> (∅)` | |

[johnkerl]

@mojaveazure can you please take a look at the R side? Thank you!

[johnkerl]

Thanks @nguyenv and @mojaveazure !