Measure SQLAlchemy 1.4 using async code and asyncpg driver

[teemuy]

Would be interesting to see how SQLAlchemy 1.4.13+ compares when using the new asyncio support.

SQLAlchemy 1.4 was heavily revamped to support async/await, and the API was cleaned up too in preparation for release 2.0 which will drop Python 2.x support. Also perf optimizations, such as 30% speedup for small queries.

https://docs.sqlalchemy.org/en/14/orm/extensions/asyncio.html
https://docs.sqlalchemy.org/en/14/changelog/migration_14.html#change-3414

[ericsouza]

Compare with piccolo orm would be nice too

[WP-LKL]

Bump. This is the key reason to utilize Tortoise over SQLAlchemy where it now is in beta.

[teemuy]

Just noticed that this had already been added just before I opened this request, but the PR #11 is still unmerged for some reason.