refactor(tabs): update api

[mlmoravek]

This is part of #606

In this pull request I refactored the tabs component from Options-API to Composition-API.
Also some improvements are made and bugs are fixed.

Proposed Changes

• Update Tabs to composition api
• Update docs
• Add new change event

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (093e2b9) 67.21% compared to head (2e932fc) 59.07%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #642      +/-   ##
===========================================
- Coverage    67.21%   59.07%   -8.14%     
===========================================
  Files           64       87      +23     
  Lines         1345     2429    +1084     
  Branches       403      814     +411     
===========================================
+ Hits           904     1435     +531     
- Misses         330      883     +553     
  Partials       111      111              

Flag	Coverage Δ
oruga	67.21% <ø> (ø)
oruga-next	48.98% <ø> (?)

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see 23 files with indirect coverage changes

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