Angus/remote file requests

[veggiesaurus]

Description

WIP for loading images from hips2fits server

Checklist

For linked issues (if there are):

• assignee and label added
• ZenHub issue connection, board status, and estimate updated

For the pull request:

• reviewers and assignee added
• ZenHub estimate, milestone, and release (if needed) added
• changelog updated / no changelog update needed
• unit test added (for functions with no dependenies)
• API documentation added (for public variables and methods in stores)

For dependencies:

• e2e test passing / corresponding fix added / new e2e test created
• protobuf version bumped / no protobuf version bumped needed
• protobuf updated to the latest dev commit / no protobuf update needed
• corresponding ICD test fix added (BackendService changed) / no ICD test fix needed (BackendService unchanged)
• user manual prepared (for large new features)

[YuHsuan-Hwang]

Ready for review.

Changes:

• Changed the "Online catalog query" dialog to "Online data query" dialog, and added two tabs for catalog queries and HiPS survey queries.
• Enabled the dialog button and the menu option when there is no image loaded.
• Added HiPS survey query UI. Users can query by either the object name or the center coordinates.
• Pinned the action buttons at the button of the dialog. The "Query" button is disabled if any of the input is not valid or a query is in progress. The "Clear" button resets the inputs.
• When a query is sent, a spinner is shown and all UI is disabled.
• Added documentation and unit tests for HipsQueryStore.

This PR is currently for the basic features of HiPS data queries. There are some possible enhancements, and I would suggest we file a new issue for them:

• For the HiPS survey text input, search for available surveys and show them in a dropdown.
• For center coordinates and fov, add shortcut buttons to set by the parameters of an active image (similar UI in the online catalog query widget).
• Add cancel button for the query (is this possible?).
• (optional) Adjust the catalog query UI for consistency.