feat(print): add print module

[laniakea2006]

Disclaimer: Do not include SAP-internal or customer-specific information in this PR (e.g. internal system URLs, customer names, tenant IDs, or confidential configurations). This is a public repository.

Description

Adds the PRINT (Print service) module to the SAP Cloud SDK for Python.

Type of Change

Please check the relevant option:

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code refactoring
• Dependency update

How to Test

Describe how reviewers can test your changes:

1. Unit tests — run all tests:
   uv run pytest tests/print/ -m "not integration" -q

2. Verify key scenarios covered by unit tests:

• test_client.py — all CRUD, search, and retention operations; validation errors; pagination
• test_config.py — credential loading from mounted volume and environment variables
• test_http.py — OAuth2 token acquisition, retry, error mapping

Checklist

Before submitting your PR, please review and check the following:

• I have read the Contributing Guidelines
• I have verified that my changes solve the issue
• I have added/updated automated tests to cover my changes
• All tests pass locally
• I have verified that my code follows the Code Guidelines
• I have updated documentation (if applicable)
• I have added type hints for all public APIs
• My code does not contain sensitive information (credentials, tokens, etc.)
• I have followed Conventional Commits for commit messages

Breaking Changes

If this PR introduces breaking changes, please describe:

• What breaks
  None
• Migration path for users
  No migration required.
• Alternative approaches considered
  N/A

Additional Notes

This feature follows the existing SDK module structure described in CONTRIBUTING.md. It is intended as an additive capability and does not change existing public APIs.