Create spiral_merge_array_traversal.py

[chawinccmkforlearn]

Describe your change:

spiral_traverse(matrix)

Takes a 2D array and returns its elements in spiral order (clockwise from the top-left).
Uses four pointers: top, bottom, left, right to track the current layer of the matrix.
Loops through top row → right column → bottom row → left column until all elements are visited.

spiral_merge_matrices(matrices)

Accepts a list of matrices.
First, converts each matrix into its spiral order list using spiral_traverse.
Then merges them alternately: take the first element from each spiral, then the second, etc., until all are merged.

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