support active check of service availability at client startup

[funky-eyes]

• I have searched the issues of this repository and believe that this is not a duplicate.

Ⅰ. Issue Description

类似dubbo的服务检查,如果没有发现该服务,或者无法与该服务的provider建立连接,将抛出异常阻止应用启动
<dubbo:reference interface="x.x.x.xxxx" check="true" />

现在一启动连不上server,也只是打个error日志,无法中断一样启动,特别是rm的连接是异步10s后建立,如果在生产可能会由于配置等问题,造成故障

Ⅱ. Describe what happened

If there is an exception, please attach the exception trace:

Just paste your stack trace here!

Ⅲ. Describe what you expected to happen

Ⅳ. How to reproduce it (as minimally and precisely as possible)

1. xxx
2. xxx
3. xxx

Ⅴ. Anything else we need to know?

Ⅵ. Environment:

• JDK version :
• Seata version:
• OS :
• Others:

[sun1341283]

assign to me plz.
需要做成可配置的还是直接报错

[funky-eyes]

assign to me plz. 需要做成可配置的还是直接报错

应该是做成一个配置项，如果未true就检查，false就不检查，true的话检查出问题要直接抛异常