Feature request: Allow session properties to be saved as segments

Describe the feature or enhancement

Use case: We want to segment all of our traffic by two session properties. We're already sending those session properties to Umami, and it works to add them manually as filters. Right now, we have to go through the multiple clicks each time — or save the URLs for boards, overviews, etc. in some other place (like a Notion page) — if we want to use that combination of session properties as a filter. It would be much more convenient if that session property filter combination could be saved as a segment. That would allow easily adding the segment across boards, overviews, and other places. I don't think this matters since I don't think segmentation and filtering are pricing tier features, but we're using Cloud Umami.

Request: Allow session properties to use the same "Save segment" feature that commonly used filter items (path, country, browser, etc.) are already able to use.