This change adds the following:
- Inject APP server zerolog RequestID as metadata into all gitrpc calls from client side.
- Inject Zerolog logger into context with common fields set (like service, method, requestID, ...). This allows for better request tracking within gitrpc, but also request tracking across services we extract the requestID send by the grpc client
- Modify http logs to use http. prefix for common http related logging annotations.
* adding server hook implementation for post and pre receive
* addressing comments
* update logging
* updating import order
* adding file header for license
