WRR-1052: Add sign language feature (backport to 4.9.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

3273

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 82.50%. Comparing base (08fcd93) to head (800f2c4). Report is 1 commits behind head on release/4.9.x.develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/4.9.x.develop #3272 +/- ## ====================================================== Coverage 82.50% 82.50% ====================================================== Files 157 157 Lines 7249 7249 Branches 1920 1920 ====================================================== Hits 5981 5981 Misses 996 996 Partials 272 272 ```

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