[FEAT]: Default client ID and client secret for each provider

[gamemaker1]

Is your feature request related to a problem? Please describe.
When creating a new drive for a different Google/Microsoft/etc account, I need to enter the client ID - client secret again. This is a bit frustrating, especially if I have not saved them somewhere when I generated them.

Describe the solution you'd like
Allow the user to set a default client ID - client secret pair per provider which is used when creating a new drive with that provider. These default client IDs and client secrets are set automatically when you create a new drive with that provider for the first time. In the future, the prompts for client ID and client secret will default to these values if no client ID and client secret is specified. These fields can be changed using the proposed config command (see #64).

Describe alternatives you've considered

• Using the client ID - client secret pair from the first drive of the same provider you find in the config file (possible, but inflexible: the user may want to use a different client ID - client secret pair)
• Making the user set the client ID and secret for each provider while setting up, before creating any drives (inconvenient)

Additional context
Also related: (#14)

[gamemaker1]

Closed by dcc7e10 (adds default values feature)