feat: codegen for molecule

[homura]

Description

Fixes #630

This PR introduces a cli lumos-molecule-codegen to generate code from molecule schemas.

Currently, there are some limitations of this codegen, such as

• the Molecule import statement is not supported yet

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• unit test
• manually test via example

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[codecov]

Codecov Report

Attention: Patch coverage is 96.89441% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 84.17%. Comparing base (ad483d9) to head (2142ad6).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #635      +/-   ##
===========================================
- Coverage    87.06%   84.17%   -2.89%     
===========================================
  Files          118      120       +2     
  Lines        24049    24356     +307     
  Branches      2442     2341     -101     
===========================================
- Hits         20938    20502     -436     
- Misses        3068     3813     +745     
+ Partials        43       41       -2     

Files	Coverage Δ
packages/codec/src/molecule/index.ts	100.00% <100.00%> (ø)
packages/codec/src/molecule/layout.ts	99.55% <100.00%> (+0.02%)	⬆️
packages/codec/src/number/uint.ts	100.00% <100.00%> (ø)
packages/molecule/src/circularIterator.ts	100.00% <100.00%> (ø)
packages/molecule/src/codegen.ts	95.95% <95.95%> (ø)

... and 9 files with indirect coverage changes

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[homura]

The first version of the codegen doesn't support the import statement of Molecule yet. To deal with the cases of importing other schemas, the codegen CLI also needs to

1. resolve all import schema items
2. remove the intersection with prepend
3. append them to the prepend

[PainterPuppets]

Amazing work!

It seems that cli can only read schemaFile from config file, it would be better if it supports setting by args.

[homura]

It seems that cli can only read schemaFile from config file, it would be better if it supports setting by args.

Exactly, we can make the CLI easier to use later