Request indicator: Detrended Price Oscillator

[niccolopetti]

I'm migrating from Pandas TA to TA-lib and this is the only indicator that is keeping me anchored to Pandas TA, I would be glad if you could add it,
here is the implementation of DPO (Detrended Price Oscillator) on Pandas TA

here some useful resources about the oscillator:
https://www.tradingview.com/scripts/detrendedpriceoscillator/
https://www.fidelity.com/learning-center/trading-investing/technical-analysis/technical-indicator-guide/dpo
http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:detrended_price_osci