Call through for global before-* and after-* blocks (fixes #64)

[ercultimate]

• Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [x] Tests for the changes have been added (for bug fixes / features) - none of the exiting or new tests explicitly verify things. I used the coverage report's execution count to verify.
• [x] Docs have been added / updated (for bug fixes / features) - no changes, the new behavior is what should be expected

• What kind of change does this PR introduce? Bug fix

• What is the current behavior? Global calls to the condition hooks are not executed on any shard. See https://github.com/joeljeske/karma-parallel/issues/64

• What is the new behavior? The wrapper function will call through to the underlying library function for global calls to before/beforeAll, beforeEach, afterEach, and after/afterAll.

• Does this PR introduce a breaking change? Unclear if in scope.

  • If the library consumer is using workarounds to run pre-/post-test logic and that logic is not idempotent, then they may see issues due to multiple executions of the pre-/post-test logic.

• Other information: