Parse path-based args

[nathanclevenger]

for a url like: https://fetcher.do/list:items,prop:value/api.cf

The value should be:

"pathArgs": {
  "list": "items",
  "prop": "value"
}

[nathanclevenger]

@AggressivelyMeows did you figure out how to do this type of parsing? I know we discussed it, but I'm not sure if it was implemented. This is going to be a critical feature for mongo.do as we need to be able to chain operations and aggregration pipelines, so we need to prioritize this.