LLC, fix bug on example generation

[weidongxu-microsoft]

Fix several TODOs here
https://github.com/Azure/autorest.java/blob/main/javagen/src/main/java/com/azure/autorest/template/ProtocolSampleTemplate.java

[weidongxu-microsoft]

One possible improvement to code readability is to group client method parameter and proxy method parameter together, e.g. similar to https://github.com/Azure/autorest.java/blob/main/fluentgen/src/main/java/com/azure/autorest/fluent/model/clientmodel/MethodParameter.java

But note that proxy method got an extra getAllParameters() to return all proxy method parameter as in spec (even when they does not appear on method signature).