Enabled multi-selection support for several commands

[sebjulliand]

Changes

As discussed here: https://github.com/orgs/codefori/discussions/2612

This PR enables multi-selection support for the following commands:

• Generate binder source
• Browse/edit members
• Browse/edit IFS files
• Maintain filter
• Custom actions
• Search source file
• Search in IFS
• Find in IFS

Run multiple custom actions

Some noticeable changes were done to allow running custom actions on multiple items.

• All the selected items must share the same nature (i.e. URI scheme) (otherwise a warning is shown)

• If the command must be prompted , it will do so for each item:

  • If the action is run on a single item, it will be prompted as usual
  • If the action is run on multiple items, it will be prompted once, keeping the variables placeholders

• The whole execution can now be cancelled. It will stop the process after the current item is done being processed
  

• The output webview had been enhanced to display multiple outputs. The left side displays items' path and the right side shows the selected item output. The icon in front of the item shows the execution result (ok, failed or not run).
  

• Running an action on a single item will only show the single output (no need for navigating through multiple results)

Search in members / Search/find in streamfiles

Finding or searching can be cancelled. The search will stop after the current path is done being processed.
Once a path has been processed, the results are added to the Search Results view, which means the view gets populated dynamically while the search is running.

How to test this PR

1. Use ctrl+click or shift+click to select multiple items in the Object browser or IFS browser
2. Check that actions are consistently shown
3. The the actions mentioned in the description

Checklist

• have tested my change

[github-actions]

👋 A new build is available for this PR based on 38ff4af.

• Download here.
• Read more about how to test

[sebjulliand]

Edit: on second thought, prompted custom actions should be prompted once and executed many times instead of prompting each item.

[worksofliam]

Generally the code looks ok but I left some comments.

[sebjulliand]

Thanks @worksofliam ; see my comment and give it a go 😀

[worksofliam]

@sebjulliand Generally it's looking good. I want to also add at least one test case for each file system in src/testing/action.ts which run an action against multiple files. What do you think?

[sebjulliand]

@worksofliam tests are in, one for each scheme as requested.
I'll let you have a final look. Thanks!