Fix JsonDocuments equals implementation

The Document impls in JsonDocuments are records, so their default
`equals` methods check that all the record members are equal. Since they
all contain JsonSettings members, two JsonDocuments are only equal if
they have the exact same JsonSettings instance.

Author: rhernandez35

codecs/json-codec/src/main/java/software/amazon/smithy/java/json/JsonDocuments.java

@@ -95,6 +95,11 @@ public ShapeDeserializer createDeserializer() {
         public void serializeContents(ShapeSerializer serializer) {
             serializer.writeString(PreludeSchemas.STRING, value);
         }
+
+        @Override
+        public boolean equals(Object obj) {
+            return Document.equals(this, obj);
+        }
     }
 
     record NumberDocument(Number value, JsonSettings settings, Schema schema) implements Document {
@@ -158,6 +163,11 @@ public ShapeDeserializer createDeserializer() {
         public void serializeContents(ShapeSerializer serializer) {
             DocumentUtils.serializeNumber(serializer, schema, value);
         }
+
+        @Override
+        public boolean equals(Object obj) {
+            return Document.equals(this, obj);
+        }
     }
 
     record BooleanDocument(boolean value, JsonSettings settings) implements Document {
@@ -180,6 +190,11 @@ public void serializeContents(ShapeSerializer serializer) {
         public ShapeDeserializer createDeserializer() {
             return new JsonDocumentDeserializer(settings, this);
         }
+
+        @Override
+        public boolean equals(Object obj) {
+            return Document.equals(this, obj);
+        }
     }
 
     record ListDocument(List<Document> values, JsonSettings settings) implements Document {
@@ -215,6 +230,11 @@ public void serializeContents(ShapeSerializer serializer) {
                 }
             });
         }
+
+        @Override
+        public boolean equals(Object obj) {
+            return Document.equals(this, obj);
+        }
     }
 
     record MapDocument(Map<String, Document> values, JsonSettings settings) implements Document {
@@ -272,6 +292,11 @@ public void serializeContents(ShapeSerializer serializer) {
                 }
             });
         }
+
+        @Override
+        public boolean equals(Object obj) {
+            return Document.equals(this, obj);
+        }
     }
 
     /**