Improve Starting Zilla with the CLI

[vordimous]

Describe the desired outcome from the user's perspective
As a developer, I want to run Zilla using the CLI tool and easily specify my zilla configuration.

Acceptance criteria

• default start command should look in the current directory
• zilla.yaml configs can be specified from a relative path
• Help command reveals what my options are
• unhide -e and add --exception-traces log name

Aditional Context

Current -c requires full path file://Users/username/path/to/zilla.yaml but doesn't support the java URI formate with ///, ex: file:///Users/username/path/to/zilla.yaml does not work.

[vordimous]

ex benthos cli:

% benthos help
NAME:
   benthos - A stream processor for mundane tasks - https://www.benthos.dev

USAGE:
   benthos [global options] command [command options] 

DESCRIPTION:
   Either run Benthos as a stream processor or choose a command:

     benthos list inputs
     benthos create kafka//file > ./config.yaml
     benthos -c ./config.yaml
     benthos -r "./production/*.yaml" -c ./config.yaml