Add serializer package

[arobsn]

In this PR

• Refactor serializer
• Serializer: add STuple type #20
• Serializer: Add support for Coll of non-embeddable types. #29
• Decouple serializer form core package #24
• Refactor tests

closes #20, closes #24, closes #29

[codecov-commenter]

Codecov Report

Merging #28 (b14b7c2) into master (0d21fc8) will not change coverage.
Report is 5 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master       #28    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           83        89     +6     
  Lines         5759      6239   +480     
  Branches      1196      1283    +87     
==========================================
+ Hits          5759      6239   +480     

Files Changed	Coverage Δ
packages/serializer/src/coders/zigZag.ts	100.00% <ø> (ø)
packages/common/src/utils/array.ts	100.00% <100.00%> (ø)
packages/common/src/utils/assertions.ts	100.00% <100.00%> (ø)
packages/common/src/utils/bytes.ts	100.00% <100.00%> (ø)
packages/compiler/src/compiler.ts	100.00% <100.00%> (ø)
packages/core/src/builder/outputBuilder.ts	100.00% <100.00%> (ø)
packages/core/src/builder/transactionBuilder.ts	100.00% <100.00%> (ø)
packages/core/src/constantSerializer.ts	100.00% <100.00%> (ø)
packages/core/src/index.ts	100.00% <100.00%> (ø)
packages/core/src/models/ergoBox.ts	100.00% <100.00%> (ø)
... and 25 more

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[ross-weir]

very neat, I'll add this to the machina finance repo