feat: dispersion integral models #677

Job	Run time
conda install latest tensorflow (ubuntu-22.04)	4m 36s
Build documentation	4m 8s
conda install (ubuntu-22.04)	2m 43s
Unit tests (ubuntu-22.04, 3.10)	17m 13s
Unit tests (macos-latest, 3.11)	10m 4s
Compatibility Testing (ubuntu-20.04, 3.6)	14m 26s
Test uproot3 (ubuntu-22.04, 3.10)	16m 17s
Unit tests (ubuntu-22.04, 3.7)	16m 1s
Style checks	2m 19s
Unit tests (ubuntu-22.04, 3.11)	15m 57s
Coverage (ubuntu-22.04, 3.10)	37s
	1h 44m 21s

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