Expose structured configuration for MCAD controllers

## WHY

Currently, MCAD relies on CLI options for configuration. This prevents the MCAD controllers from being reused in other contexts, as described in project-codeflare/adr#9.

## WHAT

The MCAD controllers should be passed structured objects for their configuration, instead of CLI options.

## HOW

As described in project-codeflare/adr#9.