Make the error handling of the SDK more reliable

[saig0]

Description

The SDK supports error handling by extracting the error code and error message from the SpaceTraders response.

Currently, the error code and message are extracted from the connector's error message by using FEEL string functions. It works but it is not very reliable.

With Camunda 8.3.3. it should be possible to access the error code and message directly from the response body. For example:

if error.code = "400" and response.body.error.code = 4236 
then bpmnError(response.body.error.code, response.body.error.message)
else null

Important: to access the error from the response body, it must be mapped in the result expression. The result expression is evaluated first. The output is the input for the error expression.

[saig0]

Currently, it is not possible to access the response data of a failed request. I created a feature request for the REST connector: camunda/connectors#2520.