Allow to predefine login actions

[tomasmik]

Added the ability to predefine the login path to take using flags, this allows for a quicker way to login with less clicking:

• You can define the --endpoint to skip the need to enter the spacelift url.
• You can define the --method to skip the choice of login method.
• You can define both the values above to skip both steps.

Also removed the confusing loop and updated selection for the login method to a prettier menu.

Command example:

spacectl profile login --method browser --endpoint https://unicorn.app.spacelift.io  local-test

Closes: #158