SNS SMS support

[MatejNedic]

:loudspeaker: Type of change

• [ ] Bugfix
• [x] New feature
• [ ] Enhancement
• [ ] Refactoring

:scroll: Description

This is currently just a draft how I vision Spring Cloud AWS support for sending SMS messages. Before I go further with tests @maciejwalkowiak please check design out.

:bulb: Motivation and Context

:green_heart: How did you test it?

:pencil: Checklist

• [x] I reviewed submitted code
• [x] I added tests to verify changes
• [x] I updated reference documentation to reflect the change
• [x] All tests passing
• [x] No breaking changes

:crystal_ball: Next steps

[MatejNedic]

Will commit sample in following days

[MatejNedic]

Tried it against real AWS integration works as expected.

[maciejwalkowiak]

Great job! Please add nullability annotations (including package-info.java) and javadocs on public classes & interfaces. Also, conflict has to be resolved.

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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