Allow duplication of tabs and splits

[Mm2PL]

Discussed in #5139

^{Originally posted by alexbo95 January 31, 2024}
I would love to have an option to duplicate a tab that I have set up with certain filters and setup, which would be accessible from right clicking the tab at the top. Thanks!

IMO Splits also should have an option to create a duplicate. Currently the best way to duplicate a split or tab is to open a popup and move the new copy, it's a little shit.

[pajlada]

Tabs will be duplicatable after #5277, but splits remaing unduplicatable