container-cross-install: add bbclass for bundling containers into images

This class enables bundling pre-built OCI containers into Yocto images
at build time. It uses vdkr/vpdmn to process containers via QEMU,
producing properly formatted storage that can be merged into the
target rootfs.

Two mechanisms for bundling containers:

1. BUNDLED_CONTAINERS variable (direct specification):
   - Set in local.conf or image recipe
   - Format: "name:runtime[:autostart][:external]"
   - Dependencies auto-generated at parse time
   - Example: BUNDLED_CONTAINERS = "container-base:docker:autostart"

2. container-bundle packages (package-based):
   - Recipes inherit container-bundle.bbclass to create packages
   - Installing packages via IMAGE_INSTALL triggers processing
   - merge_installed_bundles() scans installed OCI directories
   - Runs vrunner once in batch-import mode for efficiency

Automatic dependency generation for BUNDLED_CONTAINERS:
- Parses entries at recipe parse time via python __anonymous()
- Derives recipe name from OCI dir names (strips -latest-oci/-oci suffix)
- Generates do_rootfs[depends] on recipe:do_image_complete
- Use :external tag to skip dependency for third-party blobs
- Single "bitbake container-image-host" builds containers + image

Usage in image recipe:
    inherit container-cross-install

Features:
- Automatic detection of target architecture
- Support for both Docker and Podman runtimes
- Batch import mode for efficiency with multiple containers
- Autostart support via systemd services (Docker) or Quadlet (Podman)
- Integration with vrunner for QEMU-based processing
- Backwards compatible with legacy -latest-oci naming convention

The class processes containers during do_rootfs and merges the
resulting storage into /var/lib/docker or /var/lib/containers.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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