Move mcp-json into mcp-core, add OSGi support

Co-authored-by: Luca Chang <131398524+LucaButBoring@users.noreply.github.com>
Signed-off-by: Daniel Garnier-Moiroux <git@garnier.wf>

mcp-core/pom.xml

@@ -41,6 +41,7 @@
 								Automatic-Module-Name:  ${project.groupId}.${project.artifactId}
 								Import-Package:         jakarta.*;resolution:=optional, \
 								                        *;
+								Service-Component: 		OSGI-INF/io.modelcontextprotocol.json.McpJsonDefaults.xml
 								Export-Package:         io.modelcontextprotocol.*;version="${version}";-noimport:=true
 								-noimportjava:          true;
 								-nouses:                true;
@@ -65,11 +66,6 @@
 	</build>
 
 	<dependencies>
-        <dependency>
-            <groupId>io.modelcontextprotocol.sdk</groupId>
-            <artifactId>mcp-json</artifactId>
-            <version>0.18.0-SNAPSHOT</version>
-        </dependency>
 
 		<dependency>
 			<groupId>org.slf4j</groupId>
@@ -97,14 +93,6 @@
 			<scope>provided</scope>
 		</dependency>
 
-		<!-- Test dependencies -->
-        <dependency>
-            <groupId>io.modelcontextprotocol.sdk</groupId>
-            <artifactId>mcp-json-jackson3</artifactId>
-            <version>0.18.0-SNAPSHOT</version>
-            <scope>test</scope>
-        </dependency>
-
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-webmvc</artifactId>
@@ -112,6 +100,12 @@
 			<scope>test</scope>
 		</dependency>
 
+        <dependency>
+            <groupId>tools.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson3.version}</version>
+            <scope>test</scope>
+        </dependency>
 
 		<dependency>
 			<groupId>io.projectreactor.netty</groupId>