Grid Data Selector for Uniform Structured Grids

[program--]

This PR implements Cell, Point, Boundary, and Bounding Box based constructors for a GridDataSelector.

Additions

• GridDataSelector class
• Cell-based constructor for GridDataSelector
• Extent-based constructor for GridDataSelector
• Point-based constructor for GridDataSelector
• GridDataSelector tests with an example gridded data provider deriving from DataProvider<Cell, GridDataSelector>

TODOs

TODOs are documented alongside code documentation.

Testing

Unit tests pass locally with GCC 13.2.1 and Clang 17

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (link if applicable)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future todos are captured in comments
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️

Target Environment support

• Linux

[PhilMiller]

Everything in GridDataSelector.hpp looks good to me. Just need to go over the tests.

[PhilMiller]

In the PR description, this wording is off:

GridDataSelector class, deriving from DataProvider<Cell, GridDataSelector>.

[PhilMiller]

Test looks good to me, modulo my potential confusion or the possibility of making it a little bit stricter. So, I think this is pretty much ready to go.

[donaldwj]

The selector ends up holding a span of the point locations to be retrieved, unless I misread this. This design can probably be adapted to mesh formats although the locations will become two dimensional indices one dimension indicating postion, the other [node, edge, face]