[FIR] Add CFG nodes, add multiple subGraphs for CFGOwner

compiler/fir/analysis-tests/testData/resolveWithStdlib/contracts/fromSource/good/callsInPlace/atLeastOnce.dot

@@ -68,6 +68,7 @@ digraph atLeastOnce_kt {
     12 -> {13};
     13 -> {20};
     13 -> {14} [color=red];
+    13 -> {20} [style=dashed];
     14 -> {15};
     15 -> {16};
     16 -> {17};
@@ -114,6 +115,7 @@ digraph atLeastOnce_kt {
     28 -> {29};
     29 -> {36};
     29 -> {30} [color=red];
+    29 -> {36} [style=dashed];
     30 -> {31};
     31 -> {32};
     32 -> {33};

compiler/fir/analysis-tests/testData/resolveWithStdlib/contracts/fromSource/good/callsInPlace/atMostOnce.dot

@@ -68,6 +68,7 @@ digraph atMostOnce_kt {
     12 -> {13};
     13 -> {20};
     13 -> {14} [color=red];
+    13 -> {20} [style=dashed];
     14 -> {15};
     15 -> {16};
     16 -> {17};
@@ -113,6 +114,7 @@ digraph atMostOnce_kt {
     28 -> {29};
     29 -> {36};
     29 -> {30} [color=red];
+    29 -> {36} [style=dashed];
     30 -> {31};
     31 -> {32};
     32 -> {33};

compiler/fir/analysis-tests/testData/resolveWithStdlib/contracts/fromSource/good/callsInPlace/exactlyOnce.dot

@@ -69,6 +69,7 @@ digraph exactlyOnce_kt {
     12 -> {13};
     13 -> {21};
     13 -> {15} [color=red];
+    13 -> {21} [style=dashed];
     14 -> {16} [color=red];
     15 -> {16} [color=green];
     16 -> {17};
@@ -117,6 +118,7 @@ digraph exactlyOnce_kt {
     29 -> {30};
     30 -> {38};
     30 -> {32} [color=red];
+    30 -> {38} [style=dashed];
     31 -> {33} [color=red];
     32 -> {33} [color=green];
     33 -> {34};

compiler/fir/analysis-tests/testData/resolveWithStdlib/contracts/fromSource/good/callsInPlace/unknown.dot

@@ -68,6 +68,7 @@ digraph unknown_kt {
     12 -> {13};
     13 -> {20};
     13 -> {14} [color=red];
+    13 -> {20} [style=dashed];
     14 -> {15};
     15 -> {16};
     16 -> {17};
@@ -114,6 +115,7 @@ digraph unknown_kt {
     28 -> {29};
     29 -> {36};
     29 -> {30} [color=red];
+    29 -> {36} [style=dashed];
     30 -> {31};
     31 -> {32};
     32 -> {33};