Support User provided spec upload using Git, Postman or Plain Text editor within APIClarity

[prnam]

Is your feature request related to a problem? Please describe.
Having an option to load the User provided spec from Git / Postman and also as plain text within the API clarity helps in easy to use the tool and less context switching.

Describe the solution you'd like
User should be able to upload "user provided spec" by simply writing it on plain text editor inbuilt on APIClarity, and also by simply uploading via mentioning Git URL or Postman API spec.

Describe alternatives you've considered
None

Additional context
None