feat(programmatic): add programmatic feature

[mlmoravek]

Fixes #829

Proposed Changes

• add "programmatic" component
• update notification example

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 56 lines in your changes missing coverage. Please review.

Project coverage is 30.10%. Comparing base (484cfe8) to head (15d1d6f).
Report is 87 commits behind head on develop.

Files	Patch %	Lines
.../oruga/src/components/programmatic/Programmatic.ts	0.00%	36 Missing and 5 partials ⚠️
packages/oruga/src/utils/helpers.ts	0.00%	7 Missing and 1 partial ⚠️
.../components/notification/examples/programmatic.vue	0.00%	5 Missing ⚠️
...ackages/oruga/src/components/programmatic/index.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #944       +/-   ##
============================================
- Coverage    56.71%   30.10%   -26.62%     
============================================
  Files           30      295      +265     
  Lines         1511     7686     +6175     
  Branches       544     2162     +1618     
============================================
+ Hits           857     2314     +1457     
- Misses         654     4655     +4001     
- Partials         0      717      +717     

Flag	Coverage Δ
oruga-next	30.10% <0.00%> (-26.62%)	⬇️

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