Implements Ramer-Douglas-Peucker simplification algorithm

[Sellig6792]

Pull Request Template

Description

I implemented the Ramer-Douglas-Peucker algorithm. I use it in a project it works very well. This algorithm allow you to reduce the number of point of a polygon and to keep a maximum of precision.

The test doesn't make a real sesnse, since the results changes with the epsilon value.

• https://en.wikipedia.org/wiki/Ramer%E2%80%93Douglas%E2%80%93Peucker_algorithm
• https://fr.wikipedia.org/wiki/Algorithme_de_Douglas-Peucker (FR)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I ran bellow commands using the latest version of rust nightly. => My code doesn't make issues
• 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 94.80%. Comparing base (4248281) to head (7f4e2e3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #710      +/-   ##
==========================================
+ Coverage   94.78%   94.80%   +0.01%     
==========================================
  Files         300      301       +1     
  Lines       22274    22356      +82     
==========================================
+ Hits        21113    21195      +82     
  Misses       1161     1161              

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