feat: Adding SnapshotDemoActivity. (googlemaps-samples#433)

feat: Add SaveStateDemoActivity. (googlemaps-samples#431)

feat: Kotlin samples for RetainMapDemoActivity, ProgrammaticDemoActiv…

…ity, and OptionsDemoActivity (googlemaps-samples#430)

* Adding sample for MapInPagerDemoActivity

* Bump to gradle 6.5

* Adding MultiMapDemoActivity.

* feat: Adding OptionsDemoActivity

* Adding ProgrammaticDemoActivity.

* Add RetainMapDemoActivity.

feat: Adding sample for MapInPagerDemoActivity and MultiMapDemoActivi…

…ty (googlemaps-samples#429)

* Adding sample for MapInPagerDemoActivity

* Bump to gradle 6.5

* Adding MultiMapDemoActivity.

chore(deps): bump gradle in /tutorials/kotlin/MapWithMarker (googlema…

…ps-samples#421)

Bumps gradle from 4.0.2 to 4.1.2.

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

chore: Fix .releaserc formatting issue.