fix: Use proper SPDX license identifier

[Shortfinga]

The official id for Apache 2.0 is Apache-2.0. This would make it way easier for automatic scanners.

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Fixes #2593 with option 1

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request standardizes the Apache 2.0 license identifier across multiple setup.py files and templates by adopting the official SPDX format, 'Apache-2.0'. This update ensures better compatibility with automated license scanning tools, which is crucial for improving the project's compliance and overall maintainability.

Highlights

• Standardized License Identifier: The license string for Apache 2.0 has been updated to its official SPDX identifier, 'Apache-2.0', across various setup.py files and templates.
• Improved Automatic Scanning: This change facilitates easier and more accurate automatic license scanning, enhancing compliance and maintainability.

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[gemini-code-assist]

Code Review

This pull request updates the license identifier to the proper SPDX format, Apache-2.0, across various setup.py files and generator templates. This change improves standardization and helps automated tools correctly identify the license. The changes are consistent and have been correctly applied to the generator templates, the project's own setup file, and the corresponding golden test files. I have reviewed the changes and found no issues.

[parthea]

Thanks @Shortfinga!