Add: Hide Trailing on message typing

[x3rud]

This commit adds the hideTrailingOnType parameter on the InputOptions that allow to hide the Trailing widget if the user is typing the message

[SebastienBtr]

Hey, thanks for your contribution and trying to improve the package. However, I'm not considering merging it, next time you should open an issue so we can talk about it first.

You can already achieve it without any change in the package. On InputOptions you can use a combination of focusNode and textController or onTextChange to implement your logic and decide if you want to show or hide the trailing param

[x3rud]

Hey, no problem. Thank you!