add opcodes for zc extensions v0.70.3

[liweiwei90]

The spec for zc extension(version 0.70.3) can be found in zc spec

[aswaterman]

Ack, but we won't merge this until it is clear the encodings won't change.

[liweiwei90]

Ack, but we won't merge this until it is clear the encodings won't change.

OK. I'll update this if the encodings changes

[codecov-commenter]

Codecov Report

Merging #107 (6f959fe) into master (86edbf4) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   94.10%   94.16%   +0.06%     
==========================================
  Files           3        3              
  Lines         678      685       +7     
==========================================
+ Hits          638      645       +7     
  Misses         40       40              

Impacted Files	Coverage Δ
constants.py	100.00% <100.00%> (ø)

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[aswaterman]

Merging, since these are frozen.