Add error codes to property validation errors

[ekarademir]

Discussion 🗣

Some errors, like these, don't have error codes. They are practically validation errors but they are raised as plain errors. They should also have error codes for downstream analysis.

Context

Detailed Description

[subhajit20]

What does error codes mean ? @ekarademir

[ekarademir]

Have a look into this @subhajit20 https://github.com/accordproject/concerto/pull/773