More constructors

[burnsa2024]

Currently we only have 1 constructor, but std::discrete_distribution has several different constructors that all get the weights in slightly different ways, so we need to add each of them. All of the constructors we need to have can be found here: https://en.cppreference.com/w/cpp/numeric/random/discrete_distribution/discrete_distribution.html

[bookworm6]

Note: this is under param_type but there needs to be a constructor that takes a param_type (we can just use a wrapper that casts param_type object as a vector of doubles and then calls the normal constructor)

[burnsa2024]

For the constructor that takes "InputIt first, InputIt last", it should be allowed for first and last to be the same (using an empty array). This should then just use the default constructor (automatically construct with one weight = 1), and then selection will just select index 0 every time until weights are changed. Our current implementation gives the segmentation fault (core dumped) error when we try to select after passing in first and lasts that are the same, so this must be changed in order to be in line with STL version.