container-cross-install: add CONTAINER_SERVICE_FILE support

Add support for custom systemd service files (Docker) or Quadlet
container files (Podman) instead of auto-generated ones for container
autostart.

For containers requiring specific startup configuration (ports, volumes,
capabilities, dependencies), users can now provide custom service files
using the CONTAINER_SERVICE_FILE varflag:

  CONTAINER_SERVICE_FILE[container-name] = "${UNPACKDIR}/myservice.service"

For BUNDLED_CONTAINERS in image recipes:
  SRC_URI += "file://myapp.service"
  BUNDLED_CONTAINERS = "myapp-container:docker:autostart"
  CONTAINER_SERVICE_FILE[myapp-container] = "${UNPACKDIR}/myapp.service"

For container-bundle packages:
  SRC_URI = "file://myapp.service"
  CONTAINER_BUNDLES = "myapp-container:autostart"
  CONTAINER_SERVICE_FILE[myapp-container] = "${UNPACKDIR}/myapp.service"

Implementation:
- container-cross-install.bbclass: Add get_container_service_file_map()
  to build varflag map, install_custom_service() for BUNDLED_CONTAINERS,
  and install_custom_service_from_bundle() for bundle packages
- container-bundle.bbclass: Install custom service files to
  ${datadir}/container-bundles/${runtime}/services/

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

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