v2.107.0

This release includes internal changes to the service discovery system,
espcially when discovering control plane components (like the
destination and identity controllers). Now, the proxy attempts balance
requests across all pods in each control plane service. This requires
control plane changes to use "headless" services so that SRV records are
exposed. When the control plane services have a `clusterIP` set, the
proxy falls back to using normal A-record lookups.