GPU Batch 9

[mborland]

In this PR we continue to build out support for the distributions now that we have complete implementations of the beta and gamma function families. Adds support for: fisher f dist, gamma dist, geometric dist, inverse chi squared dist, and inverse gamma dist.

Minor change to the testing is to reduce the number of threads per block from 512 to 256. The CI system started to error on lack of resources.

Completed CI runs can be found here: https://github.com/cppalliance/cuda-math/pull/20

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.31461% with 3 lines in your changes missing coverage. Please review.

Project coverage is 94.09%. Comparing base (ab57b20) to head (d01893d). Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
include/boost/math/distributions/geometric.hpp	94.87%	2 Missing :warning:
include/boost/math/distributions/gamma.hpp	97.14%	1 Missing :warning:

Additional details and impacted files

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