Allow excluding type annotation checks

[dstepanov]

There is a bug in the annotation processor not providing type annotations for classes loaded from the classpath.
https://bugs.openjdk.java.net/browse/JDK-8225377

[Ladicek]

Looks good to me, though I'd probably call the field RUN_TYPE_ANNOTATION_TESTS (defaulting to true) so that the if statements don't have to negate the condition. But that's just nitpicking.

[dstepanov]

I did rename the property. Not sure why the build is failing.
It would be nice to have it released so we can integrate it into the test suite.

[Ladicek]

The build fails most likely because of this commit: b557cc9 That was introduced in preparation of the final CDI 4.0 release I think. Let me check locally.

[Ladicek]

I rebased this PR locally on the 4.0.0.RC6 tag and mvn clean verify passes just fine. So the build failures are just an artifact of preparation for staging the final build. That is, this PR may go in, in my opinion.

I don't know what's the process right now, but I believe we're retracting the 4.0.0 release due to a TCK deficiency anyway (see #353), so we should be able to get this in for the 4.0.0 release too. CC @starksm64