Add support for inline configuration in CLI

[nazar-pc]

Proposed change

It would be nice to be able to specify configuration options in CLI without creation of config file

Use case

The only option I need to modify is max_payload = 2MB and it is not a great UX to create a file and map it as volume into container just to change this simple value. Something like -C "max_payload = 2MB" would be so much more convenient for simple cases like this, it should be possible to specify this argument many times in order to set multiple configuration options.

Contribution

No response