Import Data button to also load region files

[Jdaviz-Triage-Bot]

Reporter: pllim

With image already loaded in Imviz, user click the "Import Data" button and select a region file (*.reg), the parser would be smart enough to run the load_regions method behind the scenes.

This would allow region file loading on standalone app with no API access. Therefore, this also allows non-interactive drawing of annulus in Imviz because annulus shape is now supported as of glue-viz/glue-astronomy#90 .

It is already implemented in #2164 but the relevant code needs to be plucked out for a clean PR. Also for annulus support only, also need new glue-astronomy release upstream (>0.7) and then update the pin in pyproject.toml (as needed).

🐱

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