feat: add support for multiple profiles

[bruuuuuuuce]

closes #3
closes #14

This pr also adds support to have multiple momento profiles on your computer.

momento configure will now prompt you for a default cache name, as well as a default ttl. This will allow you to make get and set calls without having to specify these every time

momento cache get -k myKey
momento cache set -k myKey -v myValue

you can still optionally override either one of these values to use a different ttl or cache

momento cache get -k myKey --name different-cache
momento cache set -k myKey -v myValue -ttl 12345 --name another-cache

You can use alternative profiles by setting the environment variable MOMENTO_PROFILE

MOMENTO_PROFILE=production momento cache get -k myKey

[gautamomento]

LGTM

Just one small comment.