Research: replace direct usage of markTestRunStart with onTestRunStart hook

[schaable]

On this PR I've demonstrated that the helper functions exported from the coverage and gas-analytics plugins can be replaced by using hooks for the test task, with handlers defined directly in those plugins.

In this demo, I've removed the markTestRunStart function call from the test runner actions and replaced it with the onTestRunStart hook. The same approach can be applied to markTestRunDone and markTestWorkerDone, eliminating the plugin dependency as well as allowing users to define their own handlers.

Note: Hook names and types are illustrative only. This PR is not intended to be merged.

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