Add support for HA for server and operator (#205)

This PR introduces following changes -
- Sets Pod Disruption Budget for operator and lls server
- Configures HPA for lls server.  (When HPA is enabled, `replica` field is ignored in LLSD)
- Sets `TopologySpreadConstraints` for operator and lls server


Follow-up -
- Once this PR is merged, we need to update `run.yaml` with postgres config
- Update controller to manage Postgres deployment


Approved-by: leseb

Approved-by: mfleader

Author: VaishnaviHire