Support key conditions beyond `BeginsWith` and `Between`

[Leeeei]

It seems that tempest only supports BeginsWith and Between key conditions. It would be great if it can support other conditions like >=, <=, =, > and < which are supported by AWS SDK.

[ShauniArima]

This feature seems to be a must have in order to provide something really useful.

Does someone have an idea on how to add it in tempest?

[zhxnlai]

Here is how tempest supports Filter Expression. You may want to reference this when designing API for additional Key Conditions.