Pysigma-backend-insightidr

Updated pySigma to 0.8.

Updated to pySigma 0.7.

Corrected an issue with the backend where incorrect operators could be used in output queries, when the same field name is used across different selection clauses with differing modifiers. This release also includes significantly cleaned up code. Tests were added to ensure consistent functionality. Further, this release is now fully compatible with the latest versions of the core PySigma.

This released made the following improvements:
- Added additional tests.
- Set the InsightIDR pipeline as the default/built-in processing pipeline for the InsightIDR backend (no need to specify the pipeline in the script - this will also enable easier usage in Sigma-CLI).
- Added a pipeline processing item to throw a more graceful error if unsupported aggregate function conditions are used.
- Improved filtering/conditions for existing pipeline processing items.
- Improved OR/AND condition logic in the backend (CIDR modifiers were causing issues when linked with ConditionOR or ConditionAND conditions), now grouping will only occur if all values are SigmaString or SigmaNumber values.

Fixed a bug with how numeric values are handled in the convert_condition_and() method.

Fixed a bug in the keyword detection items and added tests confirming the desired output behavior. This is in response to the issue [ConditionValueExpression arguments aren't handled properly 1](https://github.com/SigmaHQ/pySigma-backend-insightidr/issues/1#issue-1199209758).