Support new metadata format in Spring Cloud 2020.0.0 version
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theme/service-metadata
type/enhancement
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Description
For Spring Cloud 2020, it refactorys metadata logics. And we register some Spring configs as metadatas to Consul, like `spring.boot.version`. For Spring config, it often uses dot, so the issue will be
```
Caused by: com.ecwid.consul.v1.OperationException: OperationException(statusCode=400, statusMessage='Bad Request', statusContent='Invalid Service Meta: Couldn't load metadata pair ('spring.boot.version', '2.4.1'): Key contains invalid characters')
at com.ecwid.consul.v1.agent.AgentConsulClient.agentServiceRegister(AgentConsulClient.java:278)
at com.ecwid.consul.v1.ConsulClient.agentServiceRegister(ConsulClient.java:310)
```
I was surprised that dot will be a limitation with metadata key
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