Pvextractor

<!-- Release notes generated using configuration in .github/release.yml at main -->
What's Changed

New Features

- Fix for 107: allow user to ignore non-square pixel error by keflavich in https://github.com/radio-astro-tools/pvextractor/pull/113

Bug Fixes

- issubclass replaced by isinstance in PVSlicer by lpda in https://github.com/radio-astro-tools/pvextractor/pull/112
- Non-square bug in get_spatial_scale fixed by lpda in https://github.com/radio-astro-tools/pvextractor/pull/110
- bugfix: undeclared variable by keflavich in https://github.com/radio-astro-tools/pvextractor/pull/118
- Issue108: URL broken in the example use case by lpda in https://github.com/radio-astro-tools/pvextractor/pull/109

Other Changes

- Fix compatibility with latest version of astropy and update infrastructure by astrofrog in https://github.com/radio-astro-tools/pvextractor/pull/120

New Contributors

- lpda made their first contribution in https://github.com/radio-astro-tools/pvextractor/pull/112

**Full Changelog**: https://github.com/radio-astro-tools/pvextractor/compare/v0.3...v0.4

What's Changed

- Plot docs and convenience tools by keflavich in https://github.com/radio-astro-tools/pvextractor/pull/102
- Add gh actions by keflavich in https://github.com/radio-astro-tools/pvextractor/pull/103
- try to fix grid by removing 'novis' by keflavich in https://github.com/radio-astro-tools/pvextractor/pull/105
- allow DaskSpectralCube, etc. to work by keflavich in https://github.com/radio-astro-tools/pvextractor/pull/99

**Full Changelog**: https://github.com/radio-astro-tools/pvextractor/compare/v0.2...v0.3

- Update package infrastructure. 93, 96
- Fix compatibility with the latest versions of Python and Matplotlib. 89, 95
- Added `return_area` option for `extract_poly_slices`. 59
- Fix error that occurred when WCS did not have a PC matrix defined. 90

- First official release.