re-assess the tooling list and their maturity status

[gireeshpunathil]

https://github.com/nodejs/node/blob/a199387f045aa55b58c6d2e52bb69bf32c9d3d5e/doc/contributing/diagnostic-tooling-support-tiers.md

the list of tools and their support tier level are not reviewed updated for some time. tools might have moved on with capabilities / stabilities. this issue is to track the re-assessment activity.

• pick up one or more tools in the list
• discuss / examine the latest art on those
• make a decision as to whether their current slot is good, or need a change
• apply the change, otherwise identify / document any actions out of the discussion

[tony-go]

I thought it could be nice having trace_gc in the list, so I opened a PR. Let me know if you prefer having a discussion here or there.