WRR-1052: Add sign language feature (backport to 4.7.x)

[0x64]

Checklist

• [x] I have read and understand the contribution guide
• [ ] A CHANGELOG entry is included
• [ ] At least one test case is included for this feature or bug fix
• [x] Documentation was added or is not needed
• [ ] This is an API breaking change

Issue Resolved / Feature Added

Sign language services are added and require framework support.

Resolution

Added a function to support HoC for communicating with sign language service in Enact Framework.

Additional Considerations

Links

WRR-1052

3270

3272

Comments

This PR is a cherry-picking from #3270 authored by @changgilee Enact-DCO-1.0-Signed-off-by: Seungcheon Baek (sc.baek@lge.com)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.21%. Comparing base (831c79d) to head (b6e91bf). Report is 1 commits behind head on release/4.7.x.develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/4.7.x.develop #3273 +/- ## ====================================================== Coverage 82.21% 82.21% ====================================================== Files 155 155 Lines 7173 7173 Branches 1891 1893 +2 ====================================================== Hits 5897 5897 Misses 1001 1001 Partials 275 275 ```

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