Bug: Connector ignore invalid transformation configuration

[sehz]

Steps to reproduce. If any transforms section contains invalid configuration like:

# config-example.yaml
apiVersion: 0.1.0
meta:
  version: 0.3.3
  name: cat-facts
  type: http-source
  topic: cat-facts
  create-topic: true
http:
  endpoint: "https://catfact.ninja/fact"
  interval: 10s
transforms:
  - uses: infinyon/jolt@0.1.0
    with:
      -   spec:
             - operation: default
               spec:
                source: "http-connector"
             - operation: remove
                spec:
                 length: ""

connector silently drops transform section which cause user to think transform is not working when in fact transform is not even applied.

[morenol]

We could use something like what was suggested here:

serde-rs/json#447