Add Multi-Proxy Support to Docker-Compose

[sinadarbouy]

Ticket(s)

N/A

Description

This PR introduces changes to the docker-compose.yaml file to support multi-proxy configuration. The main changes are as follows:

Service Renaming and Addition:

• The existing postgres service has been renamed to write-postgres to clearly denote its role as the write database.
• A new read-postgres service has been added to handle read database operations.

Environment Variable Updates:

• Updated the gatewayd service environment variables to support separate addresses for read and write operations.
• New variables GATEWAYD_CLIENTS_DEFAULT_WRITES_ADDRESS and GATEWAYD_CLIENTS_DEFAULT_READS_ADDRESS have been introduced.

Configuration Changes:

• Updated the gatewayd service links to include both write-postgres and read-postgres.
• Modified the depends_on section to ensure both write-postgres and read-postgres are healthy before starting the gatewayd service.

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• I have added a descriptive title to this PR.
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