feat add callback_settings and public_base_url to Settings

# DEBUG=false

# HOST="0.0.0.0"

# PORT=8080

# PUBLIC_BASE_URL="http://localhost:8080"

# SRM_SETTINGS__BASE_URL="http://localhost:8081"

# SRM_SETTINGS__TIMEOUT=10.0

# NATS_SETTINGS__MAX_RECONNECT_ATTEMPTS=3

# OBSERVABILITY_SETTINGS__LOG_LEVEL="INFO"

# CALLBACK_SETTINGS__TIMEOUT=10.0

import httpx

from open_exposure_gateway.core.config import get_settings

from open_exposure_gateway.domain.quality_on_demand import QosStatusChangedCloudEvent

class HttpQodCallbackClient:

    def __init__(self) -> None:

        settings = get_settings()

        self.timeout = settings.callback_settings.timeout

    async def deliver(self, sink: str, event: QosStatusChangedCloudEvent) -> None:

        async with httpx.AsyncClient(timeout=self.timeout) as client:

            response = await client.post(

                sink,

                content=event.model_dump_json(),

                headers={"Content-Type": "application/cloudevents+json"},

            )

        response.raise_for_status()

    log_level: str = "INFO"

class CallbackSettings(BaseModel):

    timeout: float = 10.0

class Settings(BaseSettings):

    model_config = SettingsConfigDict(

        env_file=".env",

    debug: bool = False

    host: str = "0.0.0.0"

    port: int = 8080

    public_base_url: str = "http://localhost:8080"

    srm_settings: SRMSettings = SRMSettings()

    postgresql_settings: PostgreSQLSettings = PostgreSQLSettings()

    nats_settings: NatsSettings = NatsSettings()