add tests for geosearch in async tests

[kjaymiller]

Version: 6.0.0b

Platform: MacOS ARM M2 pro

Description:

In #61, I updated the repo on the sync and async side for the geo commands in valkey-py.

These commands are:

• georadius and georadiusmember (both deprecated)
• geosearch

The sync tests have tests for all three but the async tests only cover georadius and georadiusmember.

I propose adding the tests for geosearch to the async side to have parity in testing across the platforms (UNLESS there is a reason that geosearch is not testes in the async implementations)