doc: add node-report documentation

a separate section added for node-report at top level
main documentation added to doc/api/report.md
API documentation added to doc/api/process.md

PR-URL: https://github.com/nodejs/node/pull/22712


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <Michael_Dawson@ca.ibm.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>