Release 4.0.0-alpha

Changes

• Big improvement of the documentation
• Tensorflow 2.12
• Ubuntu 22.04
• OTB pre-9
• CI uses bazel cache
• Python code quality

Issues

• Closes #39 (closed)
• Closes #33 (closed)
• Closes #25 (closed)
• Closes #9 (closed)
• Closes #1 (closed)