Fixes 3231: Add a lightweight extension quicker but with more limited…

[topizio]

This implementation is meant to be a replacement for tests where automatic mock injections aren't needed but test speed is the priority. This, without allowing mocks to be over-mocked.

You can see hereby the speed on a given test, from:

to:

The test is defined as:

ExtendWith(MockitoLightweightExtension.class)
class CapabilityFeatureVerifierTest {

	private final FeatureToggleService featureToggleService = mock(FeatureToggleService.class);

	private final CapabilityFeatureVerifier capabilityFeatureVerifier = new CapabilityFeatureVerifier(
			featureToggleService);
}

Over-mocking is still detected over mock fields and regular mocks:

Thanks in advance for your time!

Checklist

• Read the contributing guide
• PR should be motivated, i.e. what does it fix, why, and if relevant how
• If possible / relevant include an example in the description, that could help all readers
  including project members to get a better picture of the change
• Avoid other runtime dependencies
• Meaningful commit history ; intention is important please rebase your commit history so that each
  commit is meaningful and help the people that will explore a change in 2 years
• The pull request follows coding style
• Mention Fixes #<issue number> in the description if relevant
• At least one commit should mention Fixes #<issue number> if relevant

[topizio]

Hi @TimvdLippe , I kindly would like to know if this PR and its related issue are enough or if by any chance I'm still missing something in order to have this PR to be processed. Many thanks in advance for your time! :-)