Time Conversion Algorithm

[prashere]

Describe your change:

I've created this PR to add time conversion functionality to the project. Inside the conversion directory, I created time_conversion.py file. It addresses the need for converting between various time units, including decades, years, months, days, weeks, minutes, and seconds.

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

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".

[tianyizheng02]

Added in #10749

I'm aware your PR is older, but unfortunately a different PR was merged instead. Sorry for the inconvenience, and I suggest you contribute a different algorithm instead.