feat: add C implementation for `stats/base/dists/geometric/mgf` #12025

Job	Run time
Add initial reaction	3s
Update copyright header years	0s
Auto-fix lint errors	0s
Check for required files	0s
Merge changes from develop branch into this PR	0s
Print a list of available slash commands	0s
Rebase this PR on top of develop branch / Rebase PR Branch onto Develop	1m 38s
Remove in-progress label	3s
	1m 44s

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