Introduce sidecar injection for the gateway

[marc-barry]

This pull request introduces sidecar injection of qtap as a proxy. To make use of this new functionality the annotations for a pod will need to be modify during Helm chart installation: https://github.com/qpoint-io/helm-charts/blob/59ac28869297de3450a0fa1dc061b76ef7809248/charts/qtap-operator/values.yaml#L46-L51

The setup is as follows:

• A namespace is labelled or pod annotation set enabling egress.
• The egress labelling will setup the init container which will force routing through the gateway. The default values as seen in https://github.com/qpoint-io/helm-charts/blob/59ac28869297de3450a0fa1dc061b76ef7809248/charts/qtap-operator/values.yaml#L46-L51 are for routing to a service and so they will need to be overridden with the example found below.
• The namespace requires the qpoint-injection=enabled label or the sidecar.qpoint.io/inject=truelabel on the pod.

Once the above is complete the operator will inject both the init container and the sidecar. An example configuration for the pod annotations is as follows:

defaultPodAnnotationsConfigmap:
  annotationsYaml: |-
    qpoint.io/inject-ca: "true"
    qpoint.io/egress-init-tag: "v0.0.7"
    qpoint.io/qtap-tag: "v0.0.9"
    qpoint.io/egress-port-mapping: "10080:80,10443:443,10000:"
    qpoint.io/log-level: "info"
    qpoint.io/block-unknown: "false"
    qpoint.io/dns-lookup-family: "V4_ONLY"

[atruslow]

👍