Migrate Kotlin Extensions to this library

[arriolac]

Is your feature request related to a problem? Please describe.
Upon integration of #898, it is no longer necessary to have a separate libraries (maps-utils-ktx and maps-utils-v3-ktx) for Kotlin idiomatic usage of this utility library.

Describe the solution you'd like
Extension functions within maps-utils-ktx, and further extension development, should exist within this library. To complete this task, I propose the following:

(1) Move extension functions within maps-ktx into a new package ("com.google.maps.android.ktx") within the library module.
(2) Add future extension functions within this package. For example, Flow extensions can exist within here.

As a side effect of this, maps-utils-ktx and maps-utils-v3-ktx should be updated to remove contained extensions effectively the util KTX libs empty artifacts that depend on the version of maps-utils containing Kotlin extensions. Lint warnings should also be created as to encourage developers to use maps-utils directly.

Describe alternatives you've considered
Continue Kotlin extension development in the KTX libraries.

Additional context
N/A

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Please comment here if it is still valid so that we can reprioritize. Thank you!

[arriolac]

Still valid

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Please comment here if it is still valid so that we can reprioritize. Thank you!

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Please comment here if it is still valid so that we can reprioritize. Thank you!

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Please comment here if it is still valid so that we can reprioritize. Thank you!