Added simplicial_polytopic_number.rs and rising_factorial.rs to /src/…

[WinterPancake]

…math

Pull Request Template

Description

simplcial_polytopic_number.rs is meant to replace triangular_number.rs and tetrahedral_number.rs.

I added simplicial_polytopic_number.rs and rising_factorial.rs to /src/math/.
Simplicial polytopic numbers are a family of sequences of figurate numbers corresponding to the d-dimensionsal simplex for each dimensional simplex for each dimension d, where d is a nonnegative integer.

Rising factorials are defined as the polynomial
(x)_n = x(x + 1)(x + 2)...(x + n - 1)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist:

• I ran bellow commands using the latest version of rust nightly.
• I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• I ran cargo fmt just before my last commit.
• I ran cargo test just before my last commit and all tests passed.
• I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• I added my algorithm to DIRECTORY.md with the correct link.
• I checked COUNTRIBUTING.md and my code follows its guidelines.

Please make sure that if there is a test that takes too long to run ( > 300ms), you #[ignore] that or
try to optimize your code or make the test easier to run. We have this rule because we have hundreds of
tests to run; If each one of them took 300ms, we would have to wait for a long time.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.28%. Comparing base (99e33d1) to head (2da705f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #898      +/-   ##
==========================================
- Coverage   95.32%   95.28%   -0.05%     
==========================================
  Files         319      321       +2     
  Lines       20807    20830      +23     
==========================================
+ Hits        19834    19847      +13     
- Misses        973      983      +10     

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