Add delete-entry command to Browser Integration API

[varjolintu]

Adds delete-entry command to Browser Integration API. User interaction is needed.

Only entry UUID is accepted as a parameter.
Returns success as true when entry was deleted, false if canceled.

Fixes #6887.

Testing strategy

Manually.

Type of change

• ✅ New feature (change that adds functionality)

[purejava]

I compiled your branch, implemented the delete-entry feature in my Java library that accesses KeePassXC via its build-in proxy and tried it out.

It worked like a charm! 🤩

[varjolintu]

I compiled your branch, implemented the delete-entry feature in my Java library that accesses KeePassXC via its build-in proxy and tried it out.

It worked like a charm! 🤩

I'm still thinking if the dialog should also show the URL just in case. There might be identical titles after all.

[droidmonkey]

Can you rebase onto develop?

[varjolintu]

Can you rebase onto develop?

Sure. Done.