process: delay and simplify the setup of async hooks trace events

src: move async hooks trace events setup to pre_execution.js

Reasons:

• Moves more environment-dependent setup out of bootstrap/node.js
• No async operations should be done before the call to the setup functions in pre_execution.js so no async hooks should be triggered before that. Therefore it is safe to delay the setup until then.

process: simplify the setup of async hooks trace events

• Remove trace_category_state from Environment - since this is only accessed in the bootstrap process and later in the trace category update handler, we could just pass the initial values into JS land via the trace_events binding, and pass the dynamic values directly to the handler later, instead of accessing them out-of-band via the AliasedBuffer.
• Instead of creating the hooks directly in trace_events_async_hooks.js, export the hook factory and create the hooks in trace category state toggle.

test: add test for node.async_hooks tracing in workers

test: add test for dynamically enabling node.async_hooks tracing

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines