container-bundle: add package-based container bundling support

This class creates installable packages that bundle pre-processed
container images. When installed via IMAGE_INSTALL, containers are
automatically merged into the target image's container storage.

Component relationships for bundling a local container:

  1. Application Recipe (builds the software)
     recipes-demo/myapp/myapp_1.0.bb
     - Compiles application binaries
     - Creates installable package (myapp)

  2. Container Image Recipe (creates OCI image containing the app)
     recipes-demo/images/myapp-container.bb
     - inherit image image-oci
     - IMAGE_INSTALL = "myapp"
     - Produces: ${DEPLOY_DIR_IMAGE}/myapp-container-latest-oci/

  3. Bundle Recipe (packages container images for deployment)
     recipes-demo/bundles/my-bundle_1.0.bb
     - inherit container-bundle
     - CONTAINER_BUNDLES = "myapp-container:autostart"
     - Creates installable package with OCI data

Flow: application recipe -> container image recipe -> bundle recipe
      -> IMAGE_INSTALL in host image -> container deployed on target

Usage:
    inherit container-bundle
    CONTAINER_BUNDLES = "myapp-container:autostart redis-container"

CONTAINER_BUNDLES format: source[:autostart-policy]
  - source: Container IMAGE recipe name or remote registry URL
  - autostart-policy: Optional (autostart, always, unless-stopped, on-failure)

Features:
- Auto-generates dependencies on container image recipes (do_image_complete)
- Supports remote containers via skopeo (requires CONTAINER_DIGESTS)
- Runtime auto-detected from CONTAINER_PROFILE (docker/podman)
- Produces OCI directories and metadata for container-cross-install

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

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