[Annotation plugin] Add bitmap API for Symbol

[Chaoba]

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Fixes: < Link to related issues that will be fixed by this pull request, if they exist >

Pull request checklist:

• Briefly describe the changes in this PR.
• Include before/after visuals or gifs if this PR includes visual changes.
• Write tests for all new functionality. If tests were not written, please explain why.
• Add example if relevant.
• Document any changes to public APIs.
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• Add an entry inside this element for inclusion in the mapbox-maps-android changelog: <changelog>[Annotation plugin] Add bitmap API for Symbol</changelog>.

Summary of changes

This pr add the bitmap API for Symbol to enable users to add a bitmap to Symbol directly instead of adding it to style.

User impact (optional)

[tobrun]

One that this this issue isn't resolving yet is for the use-case of style loading. What will happen if I use the bitmap API and load a new style? The symbol is supposed to be shown again but the style image is not part of the style spritesheet. We need to take this use-case into account and readd style images when needed.

[Chaoba]

One that this this issue isn't resolving yet is for the use-case of style loading. What will happen if I use the bitmap API and load a new style? The symbol is supposed to be shown again but the style image is not part of the style spritesheet. We need to take this use-case into account and readd style images when needed.

Every time we change to a new style, the updateSource will be invoked and the bitmap will be added to the new style, so no worry about this scenario 😄 , I will attach a gif for it.

[tobrun]

I think this is good for first iteration. I do think we can improve one specific use-case below but we can do that as tailwork:

• what happens if a user adds 2 symbols using the same iconImageBitmap? It will currently add 2 bitmaps with 2 separate ids to the style. Ideally we only add one and reuse them.