Add endpoints to read pages from older crawl WACZs into database

[tw4l]

Fixes #1597

New endpoints (replacing old migration) to re-add crawl pages to db from WACZs.

After a few implementation attempts, we settled on using remotezip to handle parsing of the zip files and streaming their contents line-by-line for pages. I've also modified the sync log streaming to use remotezip as well, which allows us to remove our own zip module and let remotezip handle the complexity of parsing zip files.

Database inserts for pages from WACZs are batched 100 at a time to help speed up the endpoint, and the task is kicked off using asyncio.create_task so as not to block before giving a response.

StorageOps now contains a method for streaming the bytes of any file in a remote WACZ, requiring only the presigned URL for the WACZ and the name of the file to stream.

[tw4l]

@ikreymer This is ready for re-review, now with remotezip. I also switched log streaming to use remotezip, so was able to remove our whole local zip module. I've done some local testing with the following results:

1. Crawl log streaming from WACZ files is working once crawl finishes (nightly test also passes)
2. Migration is working in local testing
3. Memory usage doesn't seem to increase during either 1 or 2, I think we have the streaming working properly now