Feature: devrunner config refactor

[sambukowski]

This pr updates the networks and base config of the cli to allow for dynamic loading and configuration of different services.

For the networks config, the networks-config.toml has been overhauled to allow for any number of services to be added to a given network. The internals of dev run have also been update to create and run the ProcessRunners based on the config. As a result, all networks (regardless of the services running) are now controlled by the config and dynamically created at runtime.

For the base config, the base-config.toml can now have any key-value pair added to the file and it will be parsed and added to the environment that the services are run in. To allow for this, the toml is no longer type specific and all entries are of the form snake_case_var_name = 'string value'

closes #145
closes #103

[steezeburger]

Let's rename baseConfig.go to base.go and networksConfig.go to networks.go.

This follows Go convention. Filenames should be all lower case and ideally should not duplicate the parent folder name. Since the files are in config/, I think we can drop the Config.go suffixes.

Edit for posterity: https://go.dev/blog/package-names

[steezeburger]

Let's put the values from serviceVersions.go into constants.go and delete serviceVersions.go

[steezeburger]

Looks great!