Input `payload` dynamically when a user deploy

[noahingh]

Dynamic payload provides users with flexible deployment. For example, if a user has multiple deployment strategies, you can choose a specific deployment strategy for deployment.

The implementation is such that the configuration file includes the definition of the dynamic payload like below:

dynamic_payload:
 enabled: true
 inputs:
 strategy:
 description: 'Deploy Strategy' 
 required: true
 default: 'default' 
 type: select
 options:
 - default
 - canary
 - blue-green
 canary-weight:
 description: 'Canary Weight'
 required: false 
 default: 5
 type: number