Add support for pipeline parameters

[ptitzler]

Is your feature request related to a problem? Please describe.

Pipeline parameters enable users to provide runtime parameters when submitting or exporting a Kubeflow Pipelines pipeline via the Pipeline Editor or the CLI, without the need to modify the .pipeline file. Pipeline parameters can also be provided when running a pipeline from the Kubeflow Pipelines user interfaces, such as the Central Dashboard.

Describe the solution you'd like

• Pipeline editor: allow for the definition of pipeline parameters
• Pipeline editor: allow for the assignment of pipeline parameters to custom component properties
• Pipeline editor: allow for the assignment of pipeline parameters to generic component properties
• Pipeline editor: extend the export wizard to allow for specification of pipeline parameters
• Pipeline editor: extend the submit wizard to allow for specification of pipeline parameters
• elyra-pipeline CLI: update describe command to list pipeline parameters that can be specified when exported

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context

• Requires Rewrite KFP code generation #2993
• Issues that raised this requirement:
  • bundle all node together as an executable file #2858
  • Add parameters for components and pipelines #1903
  • Pipeline input parameters #2985
  • (please add)

[ptitzler]

Delivered in #3053 and #3001