feat(annotation): enable marker positioning on LineAnnotation

[markov00]

Summary

This PR allows changing the marker position on a line annotation. The position is absolute on
the screen space and doesn't depend on the chart rotation.

This PR adds a new optional props to the <LineAnnotation> component called markerPosition?: Position;
The default position, if this property is not specified, falls back to the linked axis position (if available).

• If no axis present on the chart, the marker position is positioned by default on the bottom on the X domain
• and on the left of the chart for the Y domain. The specified position is an absolute position and reflect
• the spatial position of the marker independently from the chart rotation.

fix #701

Note: this PR doesn't change the fact that the size of the marker doesn't participate in the automatic calculation of the padding around the chart: this means that if the marker is bigger than the available padding the marker will overflow the chart component.

Checklist

Delete any items that are not applicable to this PR.

• 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

[codecov-commenter]

Codecov Report

Merging #737 into master will decrease coverage by 0.54%.
The diff coverage is 75.17%.

@@            Coverage Diff             @@
##           master     #737      +/-   ##
==========================================
- Coverage   74.80%   74.25%   -0.55%     
==========================================
  Files         265      282      +17     
  Lines        8541     8883     +342     
  Branches     1714     1788      +74     
==========================================
+ Hits         6389     6596     +207     
- Misses       2099     2227     +128     
- Partials       53       60       +7     

Impacted Files	Coverage Δ
src/chart_types/goal_chart/state/chart_state.tsx	59.18% <0.00%> (ø)
src/chart_types/index.ts	100.00% <ø> (ø)
...types/partition_chart/layout/types/config_types.ts	100.00% <ø> (ø)
...es/partition_chart/layout/types/viewmodel_types.ts	83.33% <ø> (ø)
...artition_chart/renderer/canvas/canvas_renderers.ts	6.34% <0.00%> (ø)
.../chart_types/partition_chart/state/chart_state.tsx	74.50% <0.00%> (ø)
src/chart_types/xy_chart/utils/specs.ts	100.00% <ø> (ø)
src/components/portal/utils.ts	21.42% <0.00%> (-78.58%)	⬇️
src/scales/constants.ts	100.00% <ø> (ø)
src/specs/constants.ts	100.00% <ø> (ø)
... and 69 more

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[markov00]

🎉 This PR is included in version 19.8.0 🎉

The release is available on:

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

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