Fix missing subdirectories in PyPI builds by correcting package exclusion pattern

[Copilot]

The PyPI build for version 3.2.0 was missing the api/ and models/ subdirectories, causing import errors like:

ModuleNotFoundError: No module named 'onelogin.api'

Root Cause

The issue was in the pyproject.toml setuptools configuration where the package exclusion pattern was incorrect:

# Before (incorrect)
packages = {find = {exclude = ["tests*", "docs*"]}}

# After (fixed)  
packages = {find = {exclude = ["test*", "docs*"]}}

The pattern was looking for directories starting with "tests" but the actual test directory is named "test" (singular). This caused:

1. The test directory to be incorrectly included in wheel distributions
2. Potential inconsistencies in package discovery across different build environments

Solution

Updated the exclude pattern to match the actual directory name. This ensures:

• ✅ onelogin.api package (25 API modules) is included in builds
• ✅ onelogin.models package (161 model files) is included in builds
• ✅ onelogin.saml2 package is included in builds
• ✅ Test files are properly excluded from wheel distributions
• ✅ Consistent package discovery across all build environments

Verification

Built and tested both source and wheel distributions:

• Source distribution correctly includes all packages and test files
• Wheel distribution includes all required packages but excludes test files
• Package structure verified with setuptools.find_packages()

Fixes #105.

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