feat: dispersion integral models #660

Job	Run time
conda install latest tensorflow (ubuntu-22.04)	4m 11s
Build documentation	5m 49s
Compatibility Testing (ubuntu-20.04, 3.6)	14m 29s
Unit tests (macos-latest, 3.11)	11m 14s
conda install (ubuntu-22.04)	2m 46s
Unit tests (ubuntu-22.04, 3.7)	16m 16s
Unit tests (ubuntu-22.04, 3.10)	19m 32s
Unit tests (ubuntu-22.04, 3.11)	16m 37s
Test uproot3 (ubuntu-22.04, 3.10)	16m 6s
Style checks	2m 24s
Coverage (ubuntu-22.04, 3.10)	34s
	1h 49m 58s

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