Bruno Leroux af050d95ae
Add a channel to query the engine keyboard state (#122885)
## Description

This PR adds a new channel to query the engine keyboard state.
See https://github.com/flutter/flutter/issues/87391#issuecomment-1228975571 for motivation. 

## Related Issue

Framework side implementation for https://github.com/flutter/flutter/issues/87391.

Once approved the framework will try to query the initial keyboard state from the engine. PRs will be needed on the engine side to answer the framework query.

## Tests

Adds 1 test.
2023-04-28 21:05:20 +00:00
..
2023-04-20 18:28:10 +00:00
2023-02-23 19:43:21 +00:00
2023-04-28 19:30:06 +00:00

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