support for third-party registry center property pass-through

## Why you need it?
Is your feature request related to a problem? Please describe in details

Seata has integrated with the mainstream registry and configuration centers on the market, which often have numerous attributes. We hope to directly pass these attributes to xClient without attempting to parse them. Of course, we need to ensure compatibility with previous configuration items.

## How it could be?
A clear and concise description of what you want to happen. You can explain more about input of the feature, and output of it.

## Other related information
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Start by tracing how Seata integrates with its registry and configuration centers and where xClient receives configuration attributes. Review the existing configuration-item handling to identify compatibility constraints; done means third-party attributes pass through without breaking previous configuration behavior.

Written by the indexing model from the issue text.