[google_maps_flutter_web] Add "My Location" Widget

[nploi]

Currently, we don't "My Location" widget, so this PR i want support that feature, Thanks

Issue: flutter/flutter#64073

Recreating PR from flutter/plugins from flutter/plugins#6868

List which issues are fixed by this PR. You must list at least one issue.

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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• I listed at least one issue that this PR fixes in the description above.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
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[stuartmorgan-g]

Status from triage: still waiting for @ditman to have time to review. Thanks for recreating it here!

[stuartmorgan-g]

Since this is marked as a draft and hasn't been updated in several months I'm going to close it to clean out our review queue. Please don't hesitate to submit a new PR if you decide to revisit this. Thanks!