It’s been a good year for streaming whodunits Only Murders in the Building. | Image: HuluIt all began with Natasha Lyonne calling bullshit. At the start of the year, Peacock premiered its first great original series with Poker Face, a Rian Johnson-helmed whodunit created in the mold of classic mystery-of-the-week shows. Since then, it’s been a surprisingly fruitful period for mystery shows …