feat: copy username on long press in user info screen

[jsathu07]

Proposed changes

Issue(s)

closes #5632

How to test or reproduce

Screenshots

https://github.com/RocketChat/Rocket.Chat.ReactNative/assets/61021881/81caa427-d4d5-4212-91ca-cdcfddac272c

Types of changes

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] Improvement (non-breaking change which improves a current function)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Documentation update (if none of the other choices apply)

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] I have signed the CLA
• [x] Lint and unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works (if applicable)
• [ ] I have added necessary documentation (if applicable)
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments