Use safeToString when printing stableconfig map

Author: mtoffl01

internal-api/src/main/java/datadog/trace/bootstrap/config/provider/stableconfig/Rule.java

@@ -28,7 +28,8 @@ public Rule(List<Selector> selectors, Map<String, Object> configuration) {
   public static Rule from(Map<?, ?> map) {
     Object selectorsObj = map.get("selectors");
     if (selectorsObj == null) {
-      throw new StableConfigMappingException("Missing 'selectors' in rule: " + map);
+      throw new StableConfigMappingException(
+          "Missing 'selectors' in rule: " + StableConfigMappingException.safeToString(map));
     }
 
     if (!(selectorsObj instanceof List)) {
@@ -59,7 +60,8 @@ public static Rule from(Map<?, ?> map) {
 
     Object configObj = map.get("configuration");
     if (configObj == null) {
-      throw new StableConfigMappingException("Missing 'configuration' in rule: " + map);
+      throw new StableConfigMappingException(
+          "Missing 'configuration' in rule: " + StableConfigMappingException.safeToString(map));
     }
     if (!(configObj instanceof Map)) {
       throw new StableConfigMappingException(

internal-api/src/main/java/datadog/trace/bootstrap/config/provider/stableconfig/Selector.java

@@ -20,7 +20,8 @@ public Selector(String origin, String key, List<String> matches, String operator
   public static Selector from(Map<?, ?> map) {
     Object originObj = map.get("origin");
     if (originObj == null) {
-      throw new StableConfigMappingException("Missing 'origin' in selector: " + map);
+      throw new StableConfigMappingException(
+          "Missing 'origin' in selector: " + StableConfigMappingException.safeToString(map));
     }
     if (!(originObj instanceof String)) {
       throw new StableConfigMappingException(
@@ -48,7 +49,8 @@ public static Selector from(Map<?, ?> map) {
 
     Object operatorObj = map.get("operator");
     if (operatorObj == null) {
-      throw new StableConfigMappingException("Missing 'operator' in selector: " + map);
+      throw new StableConfigMappingException(
+          "Missing 'operator' in selector: " + StableConfigMappingException.safeToString(map));
     }
     if (!(operatorObj instanceof String)) {
       throw new StableConfigMappingException(