stack::rnr Consolidate RNR from inquiry module

Moved relevant RNR into separate file with external
exceptions for le/gap delegation for le transport
and deferring back to btm security upon RNR event
received.

Bug: 349922662
Test: m .
Flag: EXEMPT, Mechanical Refactor

Change-Id: I73ef24c580ce604535e3399b5d044dd72f4f0dec