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feat: add annotation and label filters to Ambassador Host Source (#2633)

* Add annotation filter to Ambassador Host Source

This change makes the Ambassador Host source respect the External-DNS annotationFilter allowing for an Ambassador Host resource to specify what External-DNS deployment to use when there are multiple External-DNS deployments within the same cluster. Before this change if you had two External-DNS deployments within the cluster and used the Ambassador Host source the first External-DNS to process the resource will create the record and not the one that was specified in the filter annotation.

I added the `filterByAnnotations` function so that it matched the same way the other sources have implemented annotation filtering. I didn't add the controller check only because I wanted to keep this change to implementing the annotationFilter.

Example: Create two External-DNS deployments 1 public and 1 private and set the Ambassador Host to use the public External-DNS using the annotation filter.

```
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: external-dns-private
spec:
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: external-dns-private
  template:
    metadata:
      labels:
        app: external-dns-private
      annotations:
        iam.amazonaws.com/role: {ARN} # AWS ARN role
    spec:
      serviceAccountName: external-dns
      containers:
      - name: external-dns
        image: k8s.gcr.io/external-dns/external-dns:latest
        args:
        - --source=ambassador-host
        - --domain-filter=example.net # will make ExternalDNS see only the hosted zones matching provided domain, omit to process all available hosted zones
        - --provider=aws
        - --policy=upsert-only # would prevent ExternalDNS from deleting any records, omit to enable full synchronization
        - --aws-zone-type=private # only look at public hosted zones (valid values are public, private or no value for both)
  ... (continued)

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