feat: make tabs reorderable

[roele]

Description

Adds support for reordering tabs via drag-n-drop and hotkeys.

Recording.mov

As a Mac user i personally find the tab keybindings odd since pagedown/pageup requires me to press fn+down/fn+up so 4 keys in total. (Changing this might be a breaking change though)

Next Tab: cmd+pageup (should rather be cmd+opt+right, like in Chrome)
Previous Tab: cmd+pagedown (should rather be cmd+opt+left, like in Chrome)
Move Tab Left: cmd+shift+pageup (should be cmd+shift+left)
Move Tab Right: cmd+shift+pagedown (should be cmd+shift+right)

Fixes #4551 and addresses functionality from PR #4621

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

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