Add framework for reducing exceptions and logging.

[brentschmaltz]

This PR introduces an internal set of building blocks that will be used for capturing SecurityToken validation results in a consistent and deterministic manner.

We introduced the TokenValidationResult to avoid throwing back to the calling application on errors.
This work is an extension where each step captures and attaches the result to the TokenValidationResult.
All logs and exceptions are handled by upper layers.

This will be used to reduce throwing exceptions and logging.

When multiple security policies are associated with a single endpoint, for a successful validation, error logs will not be automatically written.

Latency is reduced as Exceptions are not thrown when one policy succeeds.

[jmprieur]

This is really cool, @brentschmaltz

[jennyf19]

Looks really well laid out. Thanks @brentschmaltz