Add remapping to rectilinear grids

[rajeeja]

Closes #95.

Adds native UXarray support for remapping to rectilinear structured latitude-longitude grids through remap.to_rectilinear(...), and adds YAC support for the same workflow using YAC rectilinear grid registration. The method returns regular xarray output on lat/lon dimensions, with tests and API docs for both backends. Also addresses the structured-grid YAC workflow discussed in #768 (comment).

Native UXarray backend:

out = uxda.remap.to_rectilinear(
    lon=np.linspace(0.0, 359.0, 360),
    lat=np.linspace(-89.5, 89.5, 180),
    backend="uxarray",
)

YAC backend:

out = uxda.remap.to_rectilinear(
    lon=np.linspace(0.0, 359.0, 360),
    lat=np.linspace(-89.5, 89.5, 180),
    backend="yac",
    yac_method="nnn",
    yac_options={"n": 1},
)

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Pull request overview

Adds a new remap.to_rectilinear(...) convenience API to remap UXarray data onto 1-D rectilinear lon/lat targets, returning standard xarray output on lat/lon dimensions, with support for both the native UXarray backend and YAC (including YAC rectilinear grid registration).

Changes:

• Added a rectilinear target normalization/reshape utility (RectilinearGridSpec, edge inference, and lat/lon reshaping).
• Implemented YAC rectilinear target registration and a dedicated YAC remap-to-rectilinear path.
• Exposed to_rectilinear() on the remap accessor, added tests, and documented the new API in user guide + generated API docs.

Reviewed changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uxarray/remap/yac.py	Adds rectilinear-target detection/registration and _yac_remap_to_rectilinear() returning xarray output.
uxarray/remap/structured.py	Introduces rectilinear target spec normalization (centers→edges) and reshaping utilities + native backend helper.
uxarray/remap/accessor.py	Adds public to_rectilinear() method to the remap accessor (backend switch between yac and uxarray).
test/test_remap_yac.py	Adds YAC-backed to_rectilinear() tests for node data and extra dimensions.
test/test_remap.py	Adds native backend to_rectilinear() test and direct reshape utility coverage.
docs/user-guide/remapping.ipynb	Mentions the new .remap.to_rectilinear(...) workflow for YAC.
docs/generated/uxarray.UxDataset.remap.to_rectilinear.rst	Adds generated API stub for UxDataset.remap.to_rectilinear.
docs/generated/uxarray.UxDataArray.remap.to_rectilinear.rst	Adds generated API stub for UxDataArray.remap.to_rectilinear.
docs/api.rst	Adds to_rectilinear to the API reference listings for both UxDataArray and UxDataset.

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