fuchsia.ui.input.ImeService deprecation

[kf6gpe]

From the original issue in Monorail:
https://bugs.fuchsia.dev/p/fuchsia/issues/detail?id=40944.

Fuchsia IMEv1 is deprecated, and we're trying to migrate to IMEv2.

For Flutter specifically, at least part of that includes migrating clients off DidUpdateState usage of InputEvent .

Proposed candidate for key events, that are not part of IME is fuchsia.ui.input2.Keyboard[2], as described in http://go/tq-keyboard-events

/cc @iskakaushik

[github-actions]

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