Peak detection filter

**Describe the problem you have/What new integration you would like**
Implement a peak detection filter for sensors.

Example, from this

to this

**Please describe your use case for this integration and alternatives you've tried:**
Some code in C or other languages for z-score implementation are available here:

https://stackoverflow.com/questions/22583391/peak-signal-detection-in-realtime-timeseries-data/54507140#54507140
**Additional context**

No implementation files, tests, or entry points are identified. Start by reviewing the linked real-time peak-detection reference and clarify the sensor types, configuration surface, expected behavior shown by the examples, and processing constraints. Done should include an agreed implementation scope and tests proving the filter produces the intended output.

Written by the indexing model from the issue text.