Script store shared state

[cwlittle]

This PR allows for sharing state of watched scripts for multiple instances of Relayer

[codecov-commenter]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (7d61fa1) 33.36% compared to head (b990803) 33.80%.

Files	Patch %	Lines
src/bitcoin/relayer.rs	44.00%	28 Missing :warning:
src/bin/nomic.rs	0.00%	14 Missing :warning:

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #257      +/-   ##
===========================================
+ Coverage    33.36%   33.80%   +0.43%     
===========================================
  Files           24       24              
  Lines         8260     8278      +18     
===========================================
+ Hits          2756     2798      +42     
+ Misses        5504     5480      -24     

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