Add architecture-specific boot configurators that translate the
debian-cd boot shell scripts (boot-amd64, boot-arm64, boot-ppc64el,
boot-riscv64, boot-s390x) into Python.
The package uses a class hierarchy:
- BaseBootConfigurator: abstract base with common functionality
- GrubBootConfigurator: shared GRUB config generation
- UEFIBootConfigurator: UEFI-specific shim/ESP handling
- Architecture classes: AMD64, ARM64, PPC64EL, RISCV64, S390X
A factory function make_boot_configurator_for_arch() creates the
appropriate configurator for each architecture.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
