refactor: Modularize the NetworkOPs interface (#6225)

This change moves the NetworkOPs interface into `libxrpl` and it leaves its implementation in `xrpld`.

.github/scripts/levelization/results/loops.txt

@@ -5,7 +5,7 @@ Loop: test.jtx test.unit_test
   test.unit_test == test.jtx
 
 Loop: xrpld.app xrpld.overlay
-  xrpld.overlay > xrpld.app
+  xrpld.overlay ~= xrpld.app
 
 Loop: xrpld.app xrpld.peerfinder
   xrpld.peerfinder == xrpld.app

.github/scripts/levelization/results/ordering.txt

@@ -137,6 +137,7 @@ test.rpc > xrpld.rpc
 test.rpc > xrpl.json
 test.rpc > xrpl.protocol
 test.rpc > xrpl.resource
+test.rpc > xrpl.server
 test.server > test.jtx
 test.server > test.toplevel
 test.server > test.unit_test
@@ -178,8 +179,11 @@ xrpl.resource > xrpl.protocol
 xrpl.server > xrpl.basics
 xrpl.server > xrpl.core
 xrpl.server > xrpl.json
+xrpl.server > xrpl.ledger
 xrpl.server > xrpl.protocol
 xrpl.server > xrpl.rdb
+xrpl.server > xrpl.resource
+xrpl.server > xrpl.shamap
 xrpl.shamap > xrpl.basics
 xrpl.shamap > xrpl.nodestore
 xrpl.shamap > xrpl.protocol