[#1770] node: Refactor application configuration

Split all the fields in `cfg` structure on:
1. `applicationConfiguration`;
2. `internals`; // shared entities for an application work, such as
`context.Context`
3. `shared`; // holder for the shared entities b/w;
4. `cfgXXX`; // configuration for internal services.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

cmd/neofs-node/object.go

@@ -255,7 +255,7 @@ func initObjectService(c *cfg) {
 
 	var os putsvc.ObjectStorage = engineWithoutNotifications{
 		e:     ls,
-		state: c,
+		state: &c.internals,
 	}
 
 	if c.cfgNotifications.enabled {
@@ -291,7 +291,7 @@ func initObjectService(c *cfg) {
 
 	sSearch := searchsvc.New(
 		searchsvc.WithLogger(c.log),
-		searchsvc.WithLocalStorageEngine(ls, c),
+		searchsvc.WithLocalStorageEngine(ls, &c.internals),
 		searchsvc.WithClientConstructor(coreConstructor),
 		searchsvc.WithTraverserGenerator(
 			traverseGen.WithTraverseOptions(
@@ -318,7 +318,7 @@ func initObjectService(c *cfg) {
 		),
 		getsvc.WithNetMapSource(c.netMapSource),
 		getsvc.WithKeyStorage(keyStorage),
-		getsvc.WithNodeState(c),
+		getsvc.WithNodeState(&c.internals),
 	)
 
 	*c.cfgObject.getSvc = *sGet // need smth better