SECO JUNO (SBC-D23): Perform feasibility test to run proposal graphics frameworks i.e Flutter

Add Flutter build configuration in meta-seco-rk layer. Build oniro-image-extra.

Build configuration example: https://gitlab.eclipse.org/groups/eclipse-wg/oniro-wg/proposal-incubation-stage-oniro/-/wikis/UI#usage

Related-to: https://booting.oniroproject.org/rzr/meta-oniro-blueprint-flutter/-/issues/4