Allow using custom properties for metric filtering

Problem

Currently we're not allowing to use custom properties for filtering. It can be beneficial for users so we should investigate if we can remove this limitation.

Desired Outcome

Allow to use custom propertied for metrics filtering

Potential Solution

Currently we simply compare property name in the filtering class to theoretically nothing stop us to let users use them. So technically, custom properties can be used for filtering right now.

The scope of this issue is to verify:

1. Works as expected
2. Covered by specs
3. Documented
4. Verified and agreed with Data team
5. CLI is sorted

How to verify

Further actions needed