flutter upgrade version

[bhargavraviya]

Flutter Upgrade from scratch

• Flutter Version Upgrade
• New version code changes
• Android files changes
• Package upgrade
• Android kotlin version upgrade

please check it and merge @YC

[YC]

Hi @bhargavraviya, thanks for your PR. While I agree with most of the changes, I would prefer to not review nor accept this in one single PR, given that it touches multiple separate concerns at once (e.g. refactoring, removal of ios, changes to android packaging, changes to flutter packages).

If you're okay with splitting this into multiple PRs, I'd be more than happy to review them separately. In this case, I'd welcome separate PRs for:

• Code formatting (e.g. reordering of lines)
• Flutter Version upgrades
• Routing related fixes
• Android project changes
• Other refactoring

Otherwise, I'd be happy to integrate your changes through a set of commits (giving you credit for the changes as co-contributor).

Happy to discuss further!

[YC]

Thanks again. Moving reviews to #15 and #16.