feat(starlette): add Starlette integration (#1441) by @sl0thentr0py

Important: Remove manual usage of SentryAsgiMiddleware! This is now done by the Starlette integration.

Usage:

from starlette.applications import Starlette

from sentry_sdk.integrations.starlette import StarletteIntegration

sentry_sdk.init(
    dsn="...", 
    integrations=[StarletteIntegration()],
)

app = Starlette(debug=True, routes=[...])

feat(fastapi): add FastAPI integration (#829) by @antonpirker

Important: Remove manual usage of SentryAsgiMiddleware! This is now done by the FastAPI integration.

Usage:

from fastapi import FastAPI

from sentry_sdk.integrations.starlette import StarletteIntegration
from sentry_sdk.integrations.fastapi import FastApiIntegration

sentry_sdk.init(
    dsn="...", 
    integrations=[StarletteIntegration(), FastApiIntegration()],
)

app = FastAPI()

Yes, you have to add both, the StarletteIntegration AND the FastApiIntegration!

fix: avoid sending empty Baggage header (#1507) by @intgr

fix: properly freeze Baggage object (#1508) by @intgr

docs: fix simple typo, collecter -> collector (#1505) by @timgates42

feat(tracing): Dynamic Sampling Context / Baggage continuation (#1485) by @sl0thentr0py

The SDK now propagates the W3C Baggage Header from incoming transactions to outgoing requests.
It also extracts Sentry specific sampling information and adds it to the transaction headers to enable Dynamic Sampling in the product.