feat: add debug log when sending requests via REST

[parthea]

Fixes b/381100800

The work in #2266 (comment) is still outstanding.

When running tests for async REST, I see the following stack trace. If this is expected, we should file a follow up issue in case one doesn't already exist.

Traceback (most recent call last):
  File "/usr/local/google/home/partheniou/git/gapic-generator-python/check.py", line 24, in <module>
    asyncio.run(list_instances())
  File "/usr/local/google/home/partheniou/.pyenv/versions/3.9.16/lib/python3.9/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/local/google/home/partheniou/.pyenv/versions/3.9.16/lib/python3.9/asyncio/base_events.py", line 647, in run_until_complete
    return future.result()
  File "/usr/local/google/home/partheniou/git/gapic-generator-python/check.py", line 17, in list_instances
    redis = CloudRedisAsyncClient(transport="rest_asyncio")
  File "/usr/local/google/home/partheniou/git/gapic-generator-python/tests/integration/goldens/redis/google/cloud/redis_v1/services/cloud_redis/async_client.py", line 258, in __init__
    self._client = CloudRedisClient(
  File "/usr/local/google/home/partheniou/git/gapic-generator-python/tests/integration/goldens/redis/google/cloud/redis_v1/services/cloud_redis/client.py", line 595, in __init__
    self._transport = transport_init(
  File "/usr/local/google/home/partheniou/git/gapic-generator-python/tests/integration/goldens/redis/google/cloud/redis_v1/services/cloud_redis/transports/rest_asyncio.py", line 597, in __init__
    self._session = AsyncAuthorizedSession(self._credentials)  # type: ignore
  File "/usr/local/google/home/partheniou/git/google-auth-library-python/google/auth/aio/transport/sessions.py", line 120, in __init__
    raise exceptions.InvalidType(
google.auth.exceptions.InvalidType: The configured credentials of type <class 'google.oauth2.credentials.Credentials'> are invalid and must be of type `google.auth.aio.credentials.Credentials`

using this code

from google.cloud.redis_v1 import CloudRedisAsyncClient
import asyncio
async def list_instances():
    redis = CloudRedisAsyncClient(transport="rest_asyncio")
    response = await redis.list_instances(parent="projects/partheniou-303520/locations/us-central1", metadata=[('some-key-bin', b'some_value')])
    print(response)

asyncio.run(list_instances())

[vchudnov-g]

(These comments didn't get posted yesterday)

[vchudnov-g]

Need to figure out how to obtain this.

[ohmayr]

addressed.

[vchudnov-g]

Thanks! This is the correct REST status code? (i.e. we don't translate it to gRPC?)

[ohmayr]

we don't translate it to gRPC?

What does that mean?

[ohmayr]

We can confirm the status code from the logs that I've shared in our chat.