fix(coordinate_compression): raise exceptions instead of returning -1

[AshrafHosam]

Describe your change:

Fixes inconsistent error handling in data_compression/coordinate_compression.py reported in #13509.

Previously:

• compress(x) returned -1 on missing input (silent failure)
• decompress(n) returned -1 on out-of-range input (silent failure)
• coordinate_map[x] raised KeyError (exception)

This mix of sentinels and exceptions made errors easy to miss and hard to debug.

This PR unifies the behavior to raise exceptions consistently:

• compress(x) now raises KeyError (same as the underlying coordinate_map dict)
• decompress(n) now raises IndexError with a descriptive message
• Docstrings updated to document the new Raises: contract
• Doctests updated to cover both the happy path and the error path

Fixes #13509

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Add or change doctests? -- Note: Please avoid changing solely the doctests of 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".