chore: remove enums from project

[markov00]

Summary

This PR removes all the remaining enums on the project as babel doesn't support const enum directly.
The refactoring doesn't create any breaking change, just a bit more verbose code.

@emmacunningham I've also seen a problem with the AnnotationType , not resolved in this PR but I can work on it:

export const AnnotationTypes = Object.freeze({
  Line: 'line' as AnnotationType,
  Rectangle: 'rectangle' as AnnotationType,
  Text: 'text' as AnnotationType,
});

export type AnnotationType = 'line' | 'rectangle' | 'text';

in this way, if you specify something like

const annotation = AnnotationTypes.Line

the type of annotation is AnnotationType and not line that means that if you want to do typechecking on that variable needs to go in a different way. I've fixed that behaviour specifying the exact type for every object value like Bottom: 'bottom' as 'bottom' and I've reused the typeof Position.Bottom instead of rewriting the string type. Let me know what do you think

Checklist

Use strikethroughs to remove checklist items you don't feel are applicable to this PR.

• Any consumer-facing exports were added to src/index.ts (and stories only import from ../src except for test data & storybook)
• [ ] This was checked for cross-browser compatibility, including a check against IE11
• [ ] Proper documentation or storybook story was added for features that require explanation or tutorials
• Unit tests were updated or added to match the most common scenarios
• Each commit follows the convention

[codecov-io]

Codecov Report

Merging #266 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #266      +/-   ##
==========================================
- Coverage   98.12%   98.11%   -0.01%     
==========================================
  Files          36       37       +1     
  Lines        2662     2654       -8     
  Branches      607      621      +14     
==========================================
- Hits         2612     2604       -8     
  Misses         45       45              
  Partials        5        5

Impacted Files	Coverage Δ
src/lib/series/curves.ts	100% <100%> (ø)	⬆️
src/lib/utils/interactions.ts	100% <100%> (ø)	⬆️
src/lib/themes/theme.ts	100% <100%> (ø)	⬆️
src/state/chart_state.ts	97.45% <100%> (ø)	⬆️
src/lib/series/specs.ts	100% <100%> (ø)	⬆️
src/lib/utils/scales/scales.ts	100% <100%> (ø)
src/state/annotation_utils.ts	100% <0%> (ø)	⬆️
src/lib/series/domains/y_domain.ts	100% <0%> (ø)	⬆️
src/lib/series/domains/x_domain.ts	100% <0%> (ø)	⬆️
src/lib/series/scales.ts	100% <0%> (ø)	⬆️
... and 6 more

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[emmacunningham]

code lgtm. the approach of explicitly assigning each value to itself and then using typeof in the union type definition looks good and can be extended for the annotation types.

[markov00]

🎉 This PR is included in version 8.0.2 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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