(fix) Apply bottomOffset when keyboard is shown

[joecampo]

Applying the bottomOffset prop was inadvertently removed in the PR to remove the react-safe-area-context dependency #2353 The bottomOffset props is often used when using React Navigation tabs for iOS to remove the gap created between the input/chat and keyboard. This PR restores the previous functionality of the bottomOffset prop.

Prior to this PR the bottomOffset prop was always applied when the onKeyboardWillShow event was fired. This happened regardless if gifted chat was wrapped in a safe area or not.

react-native-gifted-chat/src/GiftedChat.tsx

Line 638 in 75e75f0

this.setBottomOffset(this.safeAreaSupport(this.props.bottomOffset))

react-native-gifted-chat/src/GiftedChat.tsx

Lines 597 to 599 in 75e75f0

	safeAreaSupport = (bottomOffset?: number) => {
	return bottomOffset != null ? bottomOffset : 1
	}

I've reviewed this with the PR author amerikan (Thanks again for getting rid of this dependency!), and we both agree that this PR would resolve & restore the previous behavior.

[amerikan]

@Johan-dutoit can we merge this and maybe release a patch version, 2.0.1 or something. I overlooked one part in my previous PR that caused a regression in one of the props. @joecampo has found the problem and has the solution in this PR, which looks solid to me.

[andreas-bergstrom]

Newcomer to this lib, had to dig through some issues to find the cause of the gap. Should it perhaps be highlighted in the "Questions" section as anyone using bottom tabs from React Navigation / Expo Router will run into this?