VSCODE-86: Playgrounds and connections explorers update

[alenakhineika]

Description

• Add playgrounds explorer to the tree views
• Search for .mongodb files in the current workspace including all nested folders and excluding folders and files specified in MongoDB extension settings
• User can manage the list of excluded folders and files
• Support the refresh action in the playgrounds explorer contextual menu
• Support the create a new playground action in the playgrounds explorer contextual menu
• Open the playground by clicking on it or using a contextual menu
• For connections use the connections explorer header instead of the connections tree root

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[Anemy]

This is really good. nice. I see this getting a lot of good use. Nice work adding the setting for folder/file exclusions too - with wildcards! Left two small questions/ideas.

Also if it isn't too much work, maybe we could add one more test to the playgroundsExplorer.test.ts to make sure we're using the excludeFromPlaygroundsSearch setting correctly (more just to future proof us against small changes that might change behavior unexpectedly).

Something I need to test at some point - or have you done this by chance - is to make sure when the settings for the views are disabled like mdb.showMongoDBConnectionExplorer are set to false (the views are hidden) that vscode doesn't call getChildren on the views.

[Anemy]

Do we use this command currently? Looks like it might be an extra.

[Anemy]

Just this comment - then lgtm!

[alenakhineika]

Uh, i thought i deleted it! Now deleted for sure :)

[Anemy]

Hmm what should happen if a file was deleted, and the playgrounds list hasn't been refreshed yet, and the now non-existant playground is clicked on?
I'm thinking maybe we can show a prompt or something, currently it silently fails and passes an error to console:

[alenakhineika]

@Anemy I tested mdb.showMongoDBConnectionExplorer and showMongoDBPlaygrounds manually and they don't call getChildren if set to false. I didn't find a good way hot to cover it with unit tests, so we can add them later. Fell free to add them later as well, if you will have some ideas.

Updated PR to address other comments, thx for the valuable feedback!

[Anemy]

One small command tweak that's in the command palette, otherwise lgtm!
Nice work on this.

[Anemy]

Ah I think this one makes it into the command palette.

...
"editor/title": [{
  "command": "mdb. refreshPlaygrounds",
  "when": "false"
}
...]

Is it something we want in the command palette? In that case maybe we could add a command for that which has the MongoDB: prefix

[alenakhineika]

Added additional command for refreshing playgrounds from the command palette in addition to one is being called from the tree view. Plus test for it.

[Anemy]

lgtm!