Consolidate find_min and find_min recursive and find_max and find_max_recursive

[CaedenPH]

Describe your change:

Merges find_min and find_min_recursive into just find_min.
Merges find_min and find_max_recursive into just find_max.

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?
• Merge two different implementations into one file

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[CaedenPH]

@tianyizheng02 What is your opinion of merging the recursive and iterative implementations into one file?

Could also add benchmarks to compare the difference in time complexity between the implementations

[tianyizheng02]

I support these kinds of file merges. Like you said, it helps with benchmarking, but it also just makes it much easier to compare different implementations in general

Also helps with resolving #8098, of course

[tianyizheng02]

Now that this file also contains the recursive implementation, we should probably rename the existing find_max to find_max_iterative to contrast it with the recursive one.

[CaedenPH]

Good idea

[tianyizheng02]

find_min() -> find_min_iterative() (see previous comment)