use limit enforcing map in TelemetryContext

Author: littleaj

core/src/main/java/com/microsoft/applicationinsights/telemetry/BaseTelemetry.java

@@ -55,7 +55,7 @@ protected BaseTelemetry() {
      * @param properties The context properties
      */
     protected void initialize(ConcurrentMap<String, String> properties) {
-        this.context = new TelemetryContext(properties, new ConcurrentHashMap<String, String>());
+        this.context = new TelemetryContext(properties, new ContextTagsMap());
     }
 
     public abstract int getVer();

core/src/main/java/com/microsoft/applicationinsights/telemetry/TelemetryContext.java

@@ -45,7 +45,7 @@
  */
 public final class TelemetryContext {
     private ConcurrentMap<String,String> properties;
-    private ConcurrentMap<String,String> tags;
+    private ContextTagsMap tags;
 
     private String instrumentationKey;
     private ComponentContext component;
@@ -61,7 +61,7 @@ public final class TelemetryContext {
      * Default Ctor
      */
     public TelemetryContext() {
-        this(new ConcurrentHashMap<String, String>(), new ConcurrentHashMap<String, String>());
+        this(new ConcurrentHashMap<String, String>(), new ContextTagsMap());
     }
 
     /**
@@ -212,7 +212,7 @@ public InternalContext getInternal() {
         return internal;
     }
 
-    TelemetryContext(ConcurrentMap<String, String> properties, ConcurrentMap<String, String> tags) {
+    TelemetryContext(ConcurrentMap<String, String> properties, ContextTagsMap tags) {
         if (properties == null) {
             throw new IllegalArgumentException("properties cannot be null");
         }