[feature] modified sentinel-dubbo-adapter module DefaultDubboFallback…

[wzg923]

• [feature] modified sentinel-dubbo-adapter module DefaultDubboFallback.java class,resolve the issue Caused by: java.lang.RuntimeException: Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable #1065 [Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable]

Describe what this PR does / why we need it

fixed the bug of sentinel-dubbo-adapter [Caused by: java.lang.RuntimeException: Serialized class com.alibaba.csp.sentinel.slots.block.flow.FlowRule must implement java.io.Serializable]

Does this pull request fix one issue?

fixed issue #1065

Describe how you did it

Just wrap the BlockException to a custom RuntimeException,so the result do not contains the BlockException.

Describe how to verify it

Verify it by run the example project of sentinel-demo-dubbo .

Special notes for reviews

[CLAassistant]

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[sczyh30]

Hi, thanks for contributing. Could you please sign the CLA here? And please make sure the email of your commits match your GitHub email. You may refer to the instruction here, or rebase your commits with the correct email.

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感谢贡献，请将 commit 对应的 email 调整成与 GitHub 的 email 相匹配并 确认一下 CLA。

[sczyh30]

And could you please solve the CI failure?

[wzg923]

close this PR,edit commit email info