Adds Go package to get contracts, transactions, and scripts

[joshuahannan]

Closes: #18

Description

Adds additional code to the go package to be able to return contracts and transactions.
I would like to use embed instead of go-bindata because that seems to be easier to maintain and use.

Still working on adding and testing the rest of the transactions and scripts

The bridge standup code in main.go is commented out for now to allow for testing.

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For contributor use:

• Targeted PR against main branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.35%. Comparing base (02aab3f) to head (a9e165f).
Report is 219 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #163      +/-   ##
==========================================
+ Coverage   86.19%   87.35%   +1.15%     
==========================================
  Files          18       18              
  Lines         884     1020     +136     
==========================================
+ Hits          762      891     +129     
- Misses        122      129       +7     

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