[Feature request] A k8s seata server operator

## Why you need it?
To manage k8s based seata server resource by operator way: https://kubernetes.io/zh-cn/docs/concepts/extend-kubernetes/operator/

## How it could be?
Base on the k8s operator template to create a seata one.
I can contribute it if we can have a repo for it.

## Other related information
Some operators we contributed:
- https://github.com/nacos-group/nacos-k8s/tree/master/operator
- https://github.com/sentinel-group/sentinel-dashboard-k8s-operator

Start with the linked Kubernetes operator documentation and the referenced Nacos and Sentinel operator examples. The issue names no repository, files, tests, or detailed resource behavior; scope would need to be agreed before completion can mean a usable operator for managing Seata server resources.

Written by the indexing model from the issue text.