Draft: Release 5.0

Closes #41, #51, #53, #57

• Build with ubuntu 24 / python 3.12
• Update to TF 2.18 and OTB 9.1
• Use official TF wheels setup, simplified bazel build (--config release_*)
• Move back TF build env and OTB build flags into Dockerfile
• Update bazel build to latest specs (Clang, auto deps download HERMETIC_CUDA)
• Unified build process and base image for CPU and GPU images
• Add build arg CUDA_CC for compute capabilities
• Drop INLINE_CACHE, use dedicated repository cache => reduce images size to half
• Move python installation to venv (required for python 3.12)
• Add [dev] deps and install it in dev image to speedup pipelines
• Run release CI only on tags
• Update core module to Keras3 (example models used in failing tests)
• Move python packaging to pyproject.toml ( #41 )
• Fix SR4RS test
• Fix decloud test ?
• Update layers module to Keras3 ops ?