[RFE] Create a configuration file to allow insecure and protocol per registry

[jpower432]

What is the problem you're trying to solve
There is no way to configure the registry client per registry/namespace/repo. It would be helpful to have this when working with
implicating pulled references during the build process and linked collection pulling.

Describe the solution you'd like
Create a configuration file that can be used to configure a registry client per registry.

Additional context
Bonus points for allowing remapping of registries

[jpower432]

More information on the proposal:

This configuration file would be intended to configure the registryclient.Client used in the CLI or the gRPC server, meaning that it would contain configuration for things typically done at the host level or that would change with the same cadence.

Draft grouping (open to suggestions):

Caller configuration (sent with every request/run)

• Auth config
• Attributes
• Collection references

Host-Level Configuration (Set in a configuration file read during CLI/server startup)

• UOR Cache Location
• Registry-specific connection information (insecure, protocol, mirrors)