[google_maps_flutter_platform_interface] added getpoint to support projection method pointForMeters in iOS.

[klaes-ashford]

Description

This would enable [google_maps_flutter] Add pointForMeters to plugin in iOS #2503

Related Issues

#2503
#2503 (comment)

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[klaes-ashford]

@ditman I am unable to add reviewers for this PR. please review this. thanks.

[klaes-ashford]

review suggestions has been implemented. method channel has been renamed to projection#getPointsForMeters so that it'd leave the door open to creating a more complete set of projection calls as per @ditman's suggestion. @cyanglaz, please verify if this is the way to go.

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[klaes-ashford]

@googlebot I signed it!

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[cyanglaz]

@klaes-ashford I left some comments on the PR for plugin. We will land this when the other PR is also ready.