feat(spring-mysql-redis): add endpoint to trigger COM_STMT_RESET

[khareyash05]

Summary

• Adds GET /api/todos/stmt-reset/{id}/{n} to spring-mysql-redis that re-executes a server-side prepared statement n times on the same connection.
• Updates the JDBC URL with useServerPrepStmts=true&cachePrepStmts=true&useCursorFetch=true so MySQL Connector/J 8.x emits COM_STMT_RESET between re-executions.
• Lets us exercise the synthetic-OK fallback path added in fix(mysql/replay): synthesize OK for unmocked COM_STMT_RESET keploy#4217 during keploy record/replay.

Why

keploy/keploy#4217 fixes the case where an unmocked COM_STMT_RESET would cause keploy to close the TCP connection, surfacing as CJCommunicationsException / Socket is closed. None of the existing sample endpoints reliably trigger COM_STMT_RESET, so we need a dedicated path that forces server-side cursor reuse.

How to test

cd spring-mysql-redis
docker run --name mysql-todo -e MYSQL_DATABASE=todoapp \
  -e MYSQL_USER=yourusername -e MYSQL_PASSWORD=yourpassword \
  -e MYSQL_ROOT_PASSWORD=rootpassword -p 3306:3306 -d mysql:8
mvn -DskipTests package

# record (local keploy build with PR #4217)
keploy record -c "java -jar target/todo-spring-app-1.0-SNAPSHOT.jar"

# in another shell
curl -X POST http://localhost:8080/api/todos -H 'Content-Type: application/json' \
  -d '{"title":"t1","description":"d1","completed":false}'
curl http://localhost:8080/api/todos/stmt-reset/1/5

# replay
keploy test -c "java -jar target/todo-spring-app-1.0-SNAPSHOT.jar" --delay 20

Test plan

• mvn package succeeds (note: pre-existing Lombok/@Data config in pom.xml may need annotation-processor wiring on Java 21 — unrelated to this PR).
• keploy record against the endpoint captures the new traffic.
• keploy test replay logs show the COM_STMT_RESET debug line (stmt id) from fix(mysql/replay): synthesize OK for unmocked COM_STMT_RESET keploy#4217.
• Replay completes without CJCommunicationsException / SQLSTATE 08S01 / Socket is closed in the app logs.

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