[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: https://github.com/flutter/flutter/issues/64073

Recreating PR from flutter/plugins from https://github.com/flutter/plugins/pull/6868

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

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Pre-launch Checklist

• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [x] I read the Tree Hygiene wiki page, which explains my responsibilities.
• [x] I read and followed the relevant style guides and ran the auto-formatter. (Unlike the flutter/flutter repo, the flutter/packages repo does use dart format.)
• [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 listed 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 this PR is exempt from version changes.
• [x] I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style.
• [x] I updated/added relevant documentation (doc comments with ///).
• [x] I added new tests to check the change I am making, or this PR is test-exempt.
• [x] All existing and new tests are passing.

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[stuartmorgan]

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

[stuartmorgan]

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!