methods for calculating sound level, propagation, and attenuation

[sammlapp]

Might want to add functionality similar to scikit-maad, such as calculating geometric, atmospheric, and habitat attenuation a la Haupert et al 2022, estimating the source volume for a given received sound level, and calibrating recordings from dBFS to Leq/dB SPL

https://github.com/scikit-maad/scikit-maad/tree/production/maad/spl