Otel's Method Name is different between gRPC and HttpJson

Discovered in the Otel Draft PR: #2500

The Method Name is different between the two transports:
gRPC: Echo.Echo
HttpJson: google.showcase.v1beta1.Echo/Echo.

I believe this is because of the different Regex Matchers used to extract the MethodName:
gRPC:

Line 69 in 7902a41

    
           private static final Pattern FULL_METHOD_NAME_REGEX = Pattern.compile("^.*?([^./]+)/([^./]+)$");

HttpJson:

Line 58 in 7902a41

    
           private static final Pattern FULL_METHOD_NAME_REGEX = Pattern.compile("^(.+)\\.(.+)$");

We should be consistent and pick one way to display the method name.

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