Following things will be addressed in this ticket from overall task LENS-395:
1) Class design and modularization for error propagation (error code, error msg, stacktrace and custom error payload) from different modules of lens to REST layer
2) Ability to plug custom error codes, error messages, error payloads to be serialized and transferred from pluggable modules (drivers, rewriters, etc). Lens server might not be aware of all custom errors and their payloads at compile time.
2) Implementation of improvements in subset of use cases of estimate and execute APIs