Add FunctionInspector dependency back to SimpleFunctionRegistry since we can't remove it yet to avoid backward comatibility issues

Resolves #617

Resolves #618

Ensured Cloud Event completness by adding assertion for required attributes as well as generation of default values for attributes such as ID and SPECVERSION

Added initial test to validate builder and utils

This reverts commit 1925b490.

There was a TODO in the cloud events section of the function catalog.
This extracts that into a strategy and autoconfigures it:
CloudEventOutputMessageHeaderEnricher.

Without this change a function with a Tomcat wrapper cannot be compiled
to a native image (or it can but it fails at runtime) because there
are lambda$$$ methods in the byte code that refer to missing types.

Resolves #611

Given that s-c-f-web always sends input as Flux, it creates issues for Function<Mono, Mono>, so this fixes it
Resolves #609

Resolves #608

Helps with native images

Resolves #422
Resolves #606

Related to GH-422 and GH-606