refactor: update modal | add useProgrammatic composable

[mlmoravek]

This is part of #606

In this PR, I refactored the modal component from the Options API to the Composition API.
I also extracted the programmatic functionality into a componsable.

Fixes #568
Fixes #334

Proposed Changes

• Update Modal to composition api
  • add activeClass
  • fix destroyOnHide
    • Getting destroyOnHide prop for Modal to work #334
    • Oruga Modal seems to not be destroyed after active is updated to false #568
• Update docs
• Add useProgrammatic composable
• Adjust Notification & Loading component
• Update programmatic return type

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[codecov]

Codecov Report

Attention: 55 lines in your changes are missing coverage. Please review.

Comparison is base (4d8d58f) 63.39% compared to head (71162a8) 62.77%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #623      +/-   ##
===========================================
- Coverage    63.39%   62.77%   -0.63%     
===========================================
  Files           86       87       +1     
  Lines         5532     5587      +55     
  Branches      1566     1590      +24     
===========================================
  Hits          3507     3507              
- Misses        1914     1969      +55     
  Partials       111      111              

Flag	Coverage Δ
oruga	65.92% <ø> (ø)
oruga-next	49.29% <0.00%> (-2.71%)	⬇️

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Files	Coverage Δ
...ages/oruga-next/src/composables/useProgrammatic.ts	0.00% <0.00%> (ø)

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