Improve the TProtocol interface to facilitate more complex protocols
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                 Key: THRIFT-167
                 URL: https://issues.apache.org/jira/browse/THRIFT-167
             Project: Thrift
          Issue Type: Improvement
            Reporter: Bryan Duxbury


In doing some exploratory coding on THRIFT-110, it's clear that some 
improvements to the TProtocol interface would make things much easier. 

What I'm thinking is that we should add a new set of methods that take the 
TField and value simultaneously. For instance, we'd have writeString(str) and 
writeStringField(field, str). This way, the protocol would know explicitly that 
it can write the field id, type header, and value all at once. The exsiting 
overload (writeString(str)) would still be used when writing containers' 
contents. 

Existing protocols can implement this behavior very simply as a call to 
writeField then writeString, so we wouldn't have to do a ton of work to recode 
them completely. Code generators would have to change to take full advantage of 
this new interface, but existing generated code would still work, since we'd 
retain all the original methods. 

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