feat(mcp): resolve absolute and relative message endpoint URIs (#150)

Improve endpoint URI handling by supporting both relative paths
and properly validated absolute URIs.

- Implement URI resolution in HttpClientSseClientTransport:
- Change baseUri field from String to URI type
- Add Utils.resolveUri method to handle both absolute and relative URIs
- Resolve relative URIs against the base URI
- Validate absolute URIs to ensure they match base URI's scheme, authority, and path
- Add parameterized tests for various URI resolution scenarios
- Add ByteBuddy dependency for HttpClient mocking and update Mockito

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

mcp/pom.xml

@@ -126,12 +126,26 @@
 			<version>${junit.version}</version>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-params</artifactId>
+			<version>${junit.version}</version>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.mockito</groupId>
 			<artifactId>mockito-core</artifactId>
 			<version>${mockito.version}</version>
 			<scope>test</scope>
 		</dependency>
+
+		<!-- Mockito cannot mock this class: class java.net.http.HttpClient. the bytebuddy helps. -->
+		<dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy</artifactId>
+            <version>${byte-buddy.version}</version>
+            <scope>test</scope>
+        </dependency>
 		<dependency>
 			<groupId>io.projectreactor</groupId>
 			<artifactId>reactor-test</artifactId>