Input routing API for Input Setup Wizard

[patrickmann]

/nocl part of new feature
#relates to #20568

Description

Adds a new endpoint to PipelineResource: PUT system/pipelines/pipeline/routing
The request body consists of

{
"stream_id": string,
"input_id": "string,
"remove_from_default": boolean
}

A new routing rule is added to stage 0 of the routing pipeline gl_input_routing_pipeline.

• If the pipeline doesn't exist, it is created.
• If the rule already exists, we use the existing one
• If the rule is already included in the pipeline, we do nothing
• User may add more rules and/or stages - we ignore these (when adding routing rules)