feat: Add ENV variable support for buggregator server configuration

[butschster]

This PR enhances the configuration of the .rr-prod.yaml file to support ENV variables for better flexibility and customization during the server start.

Key changes:

• Introduced ENV variables for logging mode, encoding, and plugin-specific levels.
• Added support for ENV variables to configure HTTP CORS settings.
• Enabled ENV variables for TCP server addresses and buffer size.
• Provided better documentation for configurable fields.

This update simplifies the deployment process by allowing configurations to be modified without editing the YAML file directly, ensuring compatibility across different environments.

ENV Variables

Variable Name	Description	Default Value
RR_LOG_MODE	Logging mode: development, production, or raw.	production
RR_LOG_ENCODING	Log encoding format: console or json. Recommended json for production.	json
RR_LOG_LEVEL	Global logging level: panic, error, warn, info, debug.	warn
RR_LOG_HTTP_LEVEL	Logging level for HTTP plugin: panic, error, warn, info, debug.	warn
RR_LOG_TCP_LEVEL	Logging level for TCP plugin: panic, error, warn, info, debug.	warn
RR_LOG_CENTRIFUGE_LEVEL	Logging level for Centrifuge plugin: panic, error, warn, info, debug.	warn
RR_LOG_SERVER_LEVEL	Logging level for the server: panic, error, warn, info, debug.	warn
RR_LOG_SERVICE_LEVEL	Logging level for services: panic, error, warn, info, debug.	warn
RR_HTTP_ALLOWED_ORIGIN	Allowed origins for CORS. Typically set to specific domains or * for all.	*
RR_HTTP_ALLOWED_HEADERS	Allowed headers for CORS. Set * for all or specify headers.	*
RR_HTTP_ALLOW_CREDENTIALS	Whether CORS credentials (cookies, authorization) are allowed.	true
RR_HTTP_NUM_WORKERS	Number of workers in the HTTP pool. Determines concurrency for HTTP handling.	(Unset by default)
RR_TCP_MONOLOG_ADDR	Address for the Monolog TCP server.	:9913
RR_TCP_VAR_DUMPER_ADDR	Address for the Var-Dumper TCP server.	:9912
RR_TCP_SMTP_ADDR	Address for the SMTP TCP server.	:1025
RR_TCP_READ_BUF_SIZE	Buffer size for TCP data reading (in bytes). Higher values reduce read system calls for large payloads.	50485760 (50MB)
RR_TCP_NUM_WORKERS	Number of workers in the TCP pool. Determines concurrency for TCP handling.	(Unset by default)
RR_CENTRIFUGE_PROXY_ADDRESS	Proxy address for Centrifuge plugin.	(Unset by default)
RR_CENTRIFUGE_GRPC_API_ADDRESS	gRPC API address for Centrifuge plugin.	(Unset by default)
RR_CENTRIFUGE_NUM_WORKERS	Number of workers in the Centrifuge poll.	(Unset by default)