[Feature]: Bulk import for multiple environment imports

[bpoulaindev]

I have checked the following:

• I've searched existing issues and found nothing related to my issue.

Describe the feature you want to add

Add a way to import multiple postman environments at once.
Each environment import requires 3 clicks (at least) and is very time consuming for massive migrations.

Mockups or Images of the feature

Just make the file selection allow multiple files