Move mcp-spring-webflux and mcp-spring-webmvc to Spring AI 2.0 (#805)

The Spring-specific transport modules (mcp-spring-webflux,
mcp-spring-webmvc) have been moved out of the MCP Java SDK into the
Spring AI project (org.springframework.ai group), effective with
MCP Java SDK 1.0 and Spring AI 2.0. This is a breaking change.

- Delete mcp-spring-webflux and mcp-spring-webmvc source modules
- Remove both artifacts from mcp-bom and root pom.xml module list
- Update docs and README
- Add blog post explaining the breaking change with before/after
  migration examples

Resolves: #127

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

mcp-bom/pom.xml

@@ -54,20 +54,6 @@
                 <version>${project.version}</version>
             </dependency>
 
-            <!-- MCP Transport - WebFlux SSE -->
-            <dependency>
-                <groupId>io.modelcontextprotocol.sdk</groupId>
-                <artifactId>mcp-spring-webflux</artifactId>
-                <version>${project.version}</version>
-            </dependency>
-
-            <!-- MCP Transport - WebMVC SSE -->
-            <dependency>
-                <groupId>io.modelcontextprotocol.sdk</groupId>
-                <artifactId>mcp-spring-webmvc</artifactId>
-                <version>${project.version}</version>
-            </dependency>
-
         </dependencies>
     </dependencyManagement>