[google_maps_flutter_web] Add Advanced markers support (web)

[aednlaxer]

This PR adds Advanced markers support to the web implementation of google_maps_flutter. Approved combined PR: #7882 Approved and merged platform interface PR: #9737 Issue: #155526

Pre-Review Checklist

• [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• [x] I read the [Tree Hygiene] page, which explains my responsibilities.
• [x] I read and followed the [relevant style guides] and ran [the auto-formatter].
• [x] I signed the [CLA].
• [x] The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• [x] I [linked to at least one issue that this PR fixes] in the description above.
• [x] I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy], or I have commented below to indicate which [version change exemption] this PR falls under[^1].
• [x] I updated CHANGELOG.md to add a description of the change, [following repository CHANGELOG style], or I have commented below to indicate which [CHANGELOG exemption] this PR falls under[^1].
• [x] I updated/added any relevant documentation (doc comments with ///).
• [x] I added new tests to check the change I am making, or I have commented below to indicate which [test exemption] this PR falls under[^1].
• [ ] All existing and new tests are passing.

[stuartmorgan-g]

From triage: @aednlaxer Are you still planning on updating this PR?

[stuartmorgan-g]

FYI: After merging in main, you'll need to update the license header in all the new files with a new copy from an existing file, as the format has changed slightly.

[aednlaxer]

From triage: @aednlaxer Are you still planning on updating this PR?

Yes, please don't close it