Replicate network weights only to used NUMA nodes

On a system with multiple NUMA nodes, this patch avoids unneeded replicated
(e.g. 8x for a single threaded run), reducting memory use in that case.

Lazy initialization forced before search.

Passed STC:
https://tests.stockfishchess.org/tests/view/66a28c524ff211be9d4ecdd4
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 691776 W: 179429 L: 179927 D: 332420
Ptnml(0-2): 2573, 79370, 182547, 78778, 2620

closes https://github.com/official-stockfish/Stockfish/pull/5515

No functional change

src/engine.h

@@ -114,10 +114,10 @@ class Engine {
     StateListPtr states;
     Square       capSq;
 
-    OptionsMap                           options;
-    ThreadPool                           threads;
-    TranspositionTable                   tt;
-    NumaReplicated<Eval::NNUE::Networks> networks;
+    OptionsMap                               options;
+    ThreadPool                               threads;
+    TranspositionTable                       tt;
+    LazyNumaReplicated<Eval::NNUE::Networks> networks;
 
     Search::SearchManager::UpdateContext updateContext;
 };