feat: provider config

[troian]

Is your feature request related to a problem? Please describe.

Provider configuration is scattered around as well as not well defined in terms of module-specific settings

Describe the solution you'd like

• Define the format of the config
• config should be live-reloadable without need to restart any of the services
• each module within the provider that needs external configuration must have corresponding section within config

Describe alternatives you've considered

n/a

Search

• I did search for other open and closed issues before opening this

Code of Conduct

• I agree to follow this project's Code of Conduct

Additional context

No response

[brewsterdrinkwater]

March 12th, 2024

• This is in research and design phase.
• Goal is to have all provider related configurations in one place.

[brewsterdrinkwater]

April 9th., 2024:

• need to define pricing api in the protobuf (bid engine)