Updated select-aws-profile script to work with nushell version >= 0.94.2

[necromeo]

I've noticed that the select-aws-profile script doesn't work anymore as of nushell version 0.94.2.
I've never used that script before, therefore I don't know from which version on it stopped working.

Exporting a function with the same filename is disallowed, hence the name change to main. As per the docs:

Exporting a command called main from a module defines a command named as the module.

Also, there were scoping issues. The env vars weren't being set. Adding the --env flag fixes that.

[fdncred]

I'm not sure about renaming to main. Seems like someone could use this module and just call select-aws-profile and it work fine.

[necromeo]

Can't leave it as select-aws-profile

Error: nu::parser::named_as_module

  × Can't export command named same as the module.
   ╭─[/home/andre/.config/nushell/select-aws-profile.nu:1:18]
 1 │ export def --env select-aws-profile [] {
   ·                  ─────────┬────────
   ·                           ╰── can't export from module select-aws-profile
 2 │     hide AWS_REGION;
   ╰────
  help: Module select-aws-profile can't export command named the same as the module. Either
        change the module name, or export `main` command.

[fdncred]

ya, i think that means that the file needs to be named different than the custom command.