feat(amplify-graphql-types-generator): generate model types

[hirochachacha]

Fixes #3323

• accumulate return type of operation
• accumulate object types, interface types and union types
• generate object types, interface types and union types (for TypeScript)

This PR mainly handles TypeScript. Other frontends may have similary issue.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #3324 (9461ffd) into master (df74e0f) will increase coverage by 0.08%.
The diff coverage is 92.38%.

@@            Coverage Diff             @@
##           master    #3324      +/-   ##
==========================================
+ Coverage   57.21%   57.30%   +0.08%     
==========================================
  Files         474      474              
  Lines       21609    21666      +57     
  Branches     4078     4306     +228     
==========================================
+ Hits        12364    12415      +51     
+ Misses       8384     8370      -14     
- Partials      861      881      +20     

Impacted Files	Coverage Δ
...ify-graphql-types-generator/src/serializeToJSON.ts	84.44% <79.16%> (-7.56%)	⬇️
...l-types-generator/src/typescript/codeGeneration.ts	93.71% <93.18%> (-0.41%)	⬇️
...plify-graphql-types-generator/src/angular/index.ts	96.72% <100.00%> (ø)
...lify-graphql-types-generator/src/compiler/index.ts	91.04% <100.00%> (+0.72%)	⬆️
...graphql-types-generator/src/flow/codeGeneration.js	94.90% <100.00%> (-0.13%)	⬇️
...plify-graphql-types-generator/src/flow/language.js	96.96% <100.00%> (ø)
...graphql-types-generator/src/typescript/language.ts	92.59% <100.00%> (+2.45%)	⬆️
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
packages/graphql-mapping-template/src/print.ts	35.29% <0.00%> (ø)
packages/amplify-util-mock/src/storage/storage.ts	0.00% <0.00%> (ø)
... and 16 more

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[lgtm-com]

This pull request introduces 1 alert when merging 43a661d into df74e0f - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[akshbhu]

LGTM!

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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