Add support for OpenTelemetry resource attributes configuration

[Dzheky]

Currently, Hive Gateway's OpenTelemetry configuration only supports serviceName but doesn't support standard resource attributes like deployment.environment, service.version, etc.

Request: Add support for either:

1. Standard OpenTelemetry environment variables (OTEL_RESOURCE_ATTRIBUTES, OTEL_SERVICE_NAME, etc.)
2. A resource configuration option in the openTelemetry config