Support non-static UDS client connection paths
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- Rust
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Description
## Feature Request
Support non-static UDS client connection paths
### Motivation
Currently the UDS client example is using a static path, I believe because of the ownership requirements of the service function closure:
https://github.com/hyperium/tonic/blob/c30cb783b9e5eaa4ea05003d9cacac733d135c58/examples/src/uds/client.rs#L16-L28
It would be great if `tonic` and its `hyperium` dependencies, as needed, took ownership of the specified path to avoid the user needing to vend a `&'static str`.
### Related
- Captured path perhaps eventually should be supported through a URI that supports file URLs: https://github.com/hyperium/http/issues/323
- Proposal to update UDS client example with a workaround: #1611
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