feat: support moving cursor using keyboard gesture

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.47%. Comparing base (b6bfd11) to head (cf61e77). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ice/ime/delta_input_on_floating_cursor_update.dart	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #879 +/- ## ========================================== - Coverage 72.48% 72.47% -0.01% ========================================== Files 316 316 Lines 14757 14758 +1 ========================================== Hits 10696 10696 - Misses 4061 4062 +1 ```

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