Migration path to supporting latest version of core with null safety

[rishabhpoddar]

Now we support core 2.5, and no null safety. We support flutter 2.0, and maybe lesser than that.

We want to then support the latest version of the core, without null safety

We then want to add null safety to that.

[rishabhpoddar]

We are supporting null safety from the start. So closing this issue