SDK conformance tests from spec

[afrittoli]

This needs to be added to the requirements for SDK #4.

This issue tracks the work in the various SDKs:

• golang
• java - conformance tests at https://github.com/cdevents/sdk-java/blob/206bff75320b4186daa27cd9a0d67d4520f8e809/sdk/src/test/java/dev/cdevents/CDEventsSpecExamplesTest.java#L23
• rust
• python - not maintained right now