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Contains the logic for encoding every logical protocol field type
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FieldDescriptor) we construct two functions:  a "sizer" and an "encoder".  The
sizer takes a value of this field's type and computes its byte size.  The
encoder takes a writer function and a value.  It encodes the value into byte
strings and invokes the writer function to write those strings.  Typically the
writer function is the write() method of a BytesIO.

We try to do as much work as possible when constructing the writer and the
sizer rather than when calling them.  In particular:
* We copy any needed global functions to local variables, so that we do not need
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* Similarly, we try to do any attribute lookups at startup time if possible.
* Every field's tag is encoded to bytes at startup, since it can't change at
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* Whatever component of the field size we can compute at startup, we do.
* We *avoid* sharing code if doing so would make the code slower and not sharing
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  add an extra function call overhead for every loop iteration; instead, we
  manually inline the single-value encoder into the loop.
* If a Python function lacks a return statement, Python actually generates
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