feat UrlResolver

[xmgdtc]

1 use UrlResolver class to replace baseUrl string in ExternalTaskClientBuilder.class so that we can control how to get the address such as use load balance

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[danielkelemen]

Hi @xmgdtc,

Thank you for opening a PR!
You need sign our CLA Contributor License Agreement in order to be able to contribute.

So this feature would make it possible to change the baseUrl dynamically without restarting the client. It makes sense, I will soon review your code changes and provide some feedback.

-Daniel

[xmgdtc]

i have completed and signed this agreement thank you for your review