CLI needs documentation how to run a pipeline with extra sources (or possibly fix bug)

[lisad]

I'm trying to setup a pipeline with an additional data source called "counters". The documentation for the CLI doesn't explain how to do this and I'm not sure we built it in yet.

>  python3 -m phaser run newyork output "sources/NYC Bicycle Counts.csv"
usage: phaser run [-h] [--error-policy {ON_ERROR_WARN,ON_ERROR_COLLECT,ON_ERROR_DROP_ROW,ON_ERROR_STOP_NOW}] --counters COUNTERS
                  pipeline_name working_dir source
phaser run: error: the following arguments are required: --counters

> python3 -m phaser run --counters "sources/NYC Bicycle Counters.csv" newyork output "sources/NYC Bicycle Counts June 2025.csv"

Traceback (most recent call last):
  ... 
  ModuleNotFoundError: No module named 'pipelines.sources/NYC Bicycle Counters'

> python3 -m phaser run --counters="sources/NYC Bicycle Counters.csv" newyork output "sources/NYC Bicycle Counts June.csv"

Traceback (most recent call last):
  ... 
  ModuleNotFoundError: No module named 'pipelines.--counters=sources/NYC Bicycle Counters'