Add a smithy-java server hosting feasibility spike

changes.md

@@ -138,8 +138,8 @@ Changes log
           client writes these headers as-is, standard ones included, each name replacing the
           values produced from the Restlet API; headers defining the connection or the message
           length are ignored. SDKs that serialize and sign their own requests can rely on it.
-        - Added test-only smithy-java 1.8.0 client feasibility probes over the Restlet HTTP
-          connectors.
+        - Added test-only smithy-java 1.8.0 client and server feasibility probes over the
+          Restlet HTTP connectors.
         - Added the `EventStreamRepresentation`, `ServerSentEvent` and `EventStreamReader` APIs for
           streaming and reading Server-Sent Events over the HTTP connectors, including optional
           comment heartbeats and reconnects honoring `retry:` and `Last-Event-ID`. The

org.restlet/pom.xml

@@ -133,6 +133,24 @@
             <version>${smithy-java.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>software.amazon.smithy.java</groupId>
+            <artifactId>server-core</artifactId>
+            <version>${smithy-java.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>software.amazon.smithy.java</groupId>
+            <artifactId>aws-server-restjson</artifactId>
+            <version>${smithy-java.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>software.amazon.smithy.java</groupId>
+            <artifactId>server-rpcv2-cbor</artifactId>
+            <version>${smithy-java.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
     <build>
         <testResources>

org.restlet/src/test/java/org/restlet/engine/connector/SmithySdkTransportSpikeTestCase.java

@@ -77,7 +77,7 @@
  * transport below is a test fixture, not the production adapter.
  */
 class SmithySdkTransportSpikeTestCase {
-    private static final String MODEL =
+    static final String MODEL =
             """
             $version: "2"
             namespace spike