more-compatible TeeInput#read for POSTs with Content-Length

There are existing applications and libraries that don't check
the return value of env['rack.input'].read(length) (like Rails
:x).  Those applications became broken under the IO#readpartial
semantics of TeeInput#read when handling larger request bodies.

We'll preserve the IO#readpartial semantics _only_ when handling
chunked requests (as long as Rack allows it, it's useful for
real-time processing of audio/video streaming uploads,
especially with Rainbows! and mobile clients) but use
read-in-full semantics for TeeInput#read on requests with a
known Content-Length.

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