#394)

The CodeQL workflow was failing because the `step-security/harden-runner` was blocking egress traffic to the endpoint used for downloading the CodeQL bundle.

The download from `https://github.com/github/codeql-action/releases` redirects to `release-assets.githubusercontent.com`.

This change adds `release-assets.githubusercontent.com` to the list of allowed endpoints to resolve the `ECONNREFUSED` error and removes previous incorrect attempts.

Adds two new examples to demonstrate asynchronous and streaming capabilities:

- `cloud_run_async`: Shows how to create basic asynchronous HTTP and CloudEvent functions.
- `cloud_run_streaming_http`: Shows how to create both synchronous and asynchronous streaming HTTP functions.

The examples include instructions for running locally with the `functions-framework` CLI and deploying to Cloud Run with `gcloud`.

Python 3.7 is a decomissioned runtime. Tests are failing because of
language features not supported by this python version. Disable these
tests rather than backfixing.

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>