feat: added inputextensions returntype property

[rajamatt]

GitHub Issue (If applicable): closes #1119

PR Type

What kind of change does this PR introduce?

• Feature
• Small sample
• Documentation addition

What is the current behavior?

We have to specify android:ImeOptions="Next" and ios:ReturnKeyType="Next" if we want the return key on soft-keyboards to be Next.

What is the new behavior?

We only have to add utu:InputExtensions.ReturnType="Next" and Toolkit will handle the device specific cases itself.

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] Tested code with current supported SDKs
• [ ] Tested the changes where applicable:
  • [x] UWP
  • [x] WinUI
  • [ ] iOS
  • [x] Android
  • [x] WASM
  • [ ] MacOS
• [x] Updated the documentation as needed:
  • [ ] General Doc Update
  • [x] Controls Doc Update
  • [ ] Extensions Doc Update
  • [ ] controls-styles.md
  • [ ] lightweight-styling.md (LightWeight Styling Resource Keys)
• [ ] Runtime Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• [x] Contains NO breaking changes
• [x] Associated with an issue (GitHub or internal)
• [x] Commits must be following the Conventional Commits specification.

Other information

Internal Issue (If applicable):

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[rajamatt]

Will add docs and sample for soft-keyboards.

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