Generic implementation of factorial function

[craftycoder07]

• [x] I have performed a self-review of my code
• [x] My code follows the style guidelines of this project
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Comments in areas I changed are up to date
• [x] I have added comments to hard-to-understand areas of my code
• [] I have made corresponding changes to the README.md

[siriak]

Please also update dotnet version in https://github.com/TheAlgorithms/C-Sharp/blob/master/.github/workflows/ci.yml

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (52bf864) 95.75% compared to head (8cd5fef) 95.76%.

:exclamation: Current head 8cd5fef differs from pull request most recent head 6c69094. Consider uploading reports for the commit 6c69094 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #390 +/- ## ======================================= Coverage 95.75% 95.76% ======================================= Files 218 218 Lines 8887 8902 +15 ======================================= + Hits 8510 8525 +15 Misses 377 377 ``` | [Impacted Files](https://codecov.io/gh/TheAlgorithms/C-Sharp/pull/390?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [Algorithms/Numeric/Factorial.cs](https://codecov.io/gh/TheAlgorithms/C-Sharp/pull/390?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-QWxnb3JpdGhtcy9OdW1lcmljL0ZhY3RvcmlhbC5jcw==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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[siriak]

BinomialCoefficient was updated to work with BigInteger, so you might want to pull those changes, and it should be easier to implement this now

[craftycoder07]

I accidentally closed this pull request. Maclaurin.cs is using Factorial function as well. Do you want me to make temp changes in it?

[craftycoder07]

I am closing this pull request as solution is implemented in other pull request and is merged.