forwardRef used in defaultStyle to pass ref in MentionInput component

[gurpreet013]

Fixes #411

What did you change (functionally and technically)?
As MentionInput is wrapped by defaultStyle wrapper ref was not getting set. So In defaultStyle file under utils directory, i have used forwardRef to pass my ref to MentionInput component so that anyone can use MentionInput ref in their parent component.

Use Case
Recently i had a requirement in which after writing some query if there is only 1 suggestion and user enters space then that mention should get selected. To achieve this i checked there is no way to send custom key props in the react mention and i don't want to write selectFocused function code which covers all the use cases. So i want to use it through ref but due to the issue mentioned in #411. I was not able to do it

Checklist (remove this list before you submit the PR)

• Are there tests for the new code?
• No
• Does the code comply to our code conventions?
• Yes
• Does the PR resolve the whole issue?
• Yes

Additional review hints (remove this list before you submit the PR)

• Besides the code review, what should the reviewer test?
• Are there any edge cases?
• No
• Do you have any test files or test set-up?
• No
• Could your changes cause side effects elsewhere in the code base?
• No

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[alexandre-combemorel]

Any update on this PR ?

[atilafassina]

Thank you for the PR, @gurpreet013

@alexandre-combemorel

The project has collected a few dust, but after a few changes in governance, I'm now reviewing/merging.
Please, give me some little time more as I get a hold of issues and figure stuff out 😅

[gurpreet013]

@atilafassina Any update on this?

[lspdv]

Hey 👋 I am +1 to look at this PR please. 🙏 Thank you :-)