[Feature🚀] Implement Controller Command: Re-elect Master (electMaster)

[mxsm]

Feature Description

Implement the Controller command electMaster for rocketmq-rust project to manually trigger Broker Master election and promote a specified Broker replica to Master.

This command corresponds to ReElectMasterSubCommand in Apache RocketMQ Java version.

Problem/Motivation

The current rocketmq-rust project lacks Broker Master manual election tools, making it impossible to quickly restore service in the following scenarios:

1. Failure Recovery: Cannot manually trigger election after current Master node failure
2. Master-Slave Switchover: Cannot manually promote specified Slave to Master
3. Operational Adjustments: Cannot manually adjust Master node based on load
4. High Availability Testing: Cannot verify master-slave switchover functionality

Use Cases:

• Manually trigger election after Master node failure
• Specify a particular Broker ID as new Master
• Load balancing adjustments
• Disaster recovery drills

Java Source Reference:
https://github.com/apache/rocketmq/blob/develop/tools/src/main/java/org/apache/rocketmq/tools/command/controller/ReElectMasterSubCommand.java

[YashIIT0909]

Hey @mxsm, I would like to work on this issue