Ensure proper incremental filtering + test for session_number

[rjh336]

Description & motivation

This addresses #80 -- made a modification to the new macro to take a comparison operator since we need to filter before the segment_sessionization_trailing_window and after in segment_web_sessions.

Also added a test to make sure session_number does not repeat for users.

cc @joellabes

Checklist

• I have verified that these changes work locally
• I have updated the README.md (if applicable)
• I have added tests & descriptions to my models (and macros if applicable)

[joellabes]

@rjh336 did you mean to close this?

[rjh336]

@rjh336 did you mean to close this?

@joellabes I did originally because I saw the new test failing after testing in my own project a few times but realized it was related to a different problem outside the scope of this package

[joellabes]

OK! this makes sense 👍 let's do it!