async_hooks: expose list of types

Ref: https://github.com/nodejs/node/pull/13561#issuecomment-307555956

Also refactor JS type names allocation, so it provided by asunc_hooks

/cc @nodejs/async_hooks

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

Affected core subsystem(s)

async_hooks,timers,process