Add bubble sort

[anumolusneha]

Describe your change:

Added the Bubble Sort algorithm in Python inside the sorts directory. This implementation sorts a list of numbers in ascending order and includes doctests for verification.

• [x] Add an algorithm
• [x] Fix a bug or typo in an existing algorithm?
• [x] Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• [x] Documentation change?

Checklist:

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized.
• [x] I know that pull requests will not be merged if they fail the automated tests.
• [x] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [x] All new Python files are placed inside an existing directory.
• [x] All filenames are in all lowercase characters with no spaces or dashes.
• [x] All functions and variable names follow Python naming conventions.
• [x] All function parameters and return values are annotated with Python type hints.
• [x] All functions have doctests that pass the automated testing.
• [x] All new algorithms include at least one URL that points to Wikipedia or another similar explanation: Bubble Sort.
• [x] 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".

[anumolusneha]

Hi maintainers 👋, I’ve added the Bubble Sort algorithm and all checks have passed. Could you please review this PR when you get a chance? Thanks!

[anumolusneha]

Hi @mindaugl, The pull request is still in progress. I will request an approving review once the remaining updates are completed.