Extract markers into plugin

[illetid]

Type of PR: enhancement

• N/A Addresses an existing issue: fixes #
• Includes tests
• Documentation update

Overview of change:
Moved a series markers into a built-in plugin to enable tree shaking

[github-actions]

size-limit report 📦

Path	Size
ESM	43.39 KB (+0.73% 🔺)
ESM createChart	40.3 KB (-3.6% 🔽)
ESM createChartEx	39.08 KB (-3.63% 🔽)
ESM Standalone	44.91 KB (+0.9% 🔺)
Standalone	44.87 KB (+0.9% 🔺)
Plugin: Text Watermark	1.87 KB (+4.48% 🔺)
Plugin: Image Watermark	1.7 KB (+5.33% 🔺)
Plugin: Series Markers	3.89 KB (+100% 🔺)

[SlicedSilver]

• Could we also add a short documentation page for the plugin?
• I know the graphics tests will fail because the interface changed. Did you manage to run the tests locally before the changes, save those images somewhere, and then run again with the current changes? If so, could you check that the screenshots are the same? It's a bit of pain to manually do this I guess. Downside of our current screenshot testing system.

[SlicedSilver]

• There is a failing test within the 'coverage' e2e suite.
• Could you check the graphics e2e tests and ensure that all the tests are generating a 2. test.png and that the image looks correct. You might need to run the tests locally on golden (v5-candidate) with these line removed:

  lightweight-charts/tests/e2e/graphics/graphics-test-cases.ts

  Line 213 in a20f084

  rmRf(testCaseOutDir);

  to get the correct baseline images and store them somewhere. Then run the e2e tests again but this time on this branch (and that line added back in), and then manually compare the images. Perhaps by having a script get the matching images for the baseline folder and the tests folder → place them into a new directory with naming like: series-markers_test.png and series-markers_golden.png and then you can quickly go through the images one by one and quickly notice if anything looks different. (mac quicklook and arrow keys work well for this)

[illetid]

• There is a failing test within the 'coverage' e2e suite.
• Could you check the graphics e2e tests and ensure that all the tests are generating a 2. test.png and that the image looks correct. You might need to run the tests locally on golden (v5-candidate) with these line removed:

  lightweight-charts/tests/e2e/graphics/graphics-test-cases.ts

  Line 213 in a20f084

  rmRf(testCaseOutDir);

  
  to get the correct baseline images and store them somewhere. Then run the e2e tests again but this time on this branch (and that line added back in), and then manually compare the images. Perhaps by having a script get the matching images for the baseline folder and the tests folder → place them into a new directory with naming like: series-markers_test.png and series-markers_golden.png and then you can quickly go through the images one by one and quickly notice if anything looks different. (mac quicklook and arrow keys work well for this)

I've checked all the screenshots. Fixed one small issue with margins that I've spotted in progress, and failing coverage tests are also fixed, I used wrong interface as returned type and ts-transformer renamed properties that should be public.
attached zip with tests results and added in each folder image from reference run to check with
devicePixelRatio=2.00.zip

[SlicedSilver]