Warn users if they are on an old IntelliJ plugin

[jacob314]

If a user updates to the latest Flutter but is still using an old IntelliJ plugin we should warn them that they should also update their Flutter IntelliJ plugin to get the best experience.

Similarly, if a user hits an exception and is using an old IntelliJ plugin we should suggest they update their plugin to see if that fixes the issue before filing a bug.

This should help avoid bug reports like #3955 which cost our team time and lead users to think that our tools are buggy even when we have fixed the bugs.

[OmAximani0]

Hey, I want to contribute on this but not getting how to start. Can someone please help ?

[kalexandru]

Hi @jacob314 , nice to meet you!
If it is possible I would like to help with this issue, you could assign it to me!