Fix: Max Number Length after Genesis

[tigh-latte]

The max num length is 750kb after genesis, however in our interpreter it is currently set at 4.

Moving it to the genesis config lib.

[codecov-commenter]

Codecov Report

Merging #78 (c3b35db) into master (0cd048b) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   84.99%   85.02%   +0.03%     
==========================================
  Files          30       30              
  Lines        3052     3059       +7     
==========================================
+ Hits         2594     2601       +7     
  Misses        318      318              
  Partials      140      140              

Impacted Files	Coverage Δ
bscript/interpreter/scriptnum.go	100.00% <ø> (ø)
bscript/interpreter/config.go	100.00% <100.00%> (ø)
bscript/interpreter/operations.go	96.16% <100.00%> (ø)
bscript/interpreter/stack.go	94.03% <100.00%> (+0.16%)	⬆️
bscript/interpreter/thread.go	93.48% <100.00%> (-0.03%)	⬇️

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