feat(amplify-codegen): Migrate codegen

[AaronZyLee]

Issue #, if available:

Description of changes:

• Bump the codegen to a new minor version published from the new repo. The packages involved: amplify-cli, amplify-provider-awscloudformation, amplify-util-mock
• Remove the old package
• Change the plugin version matching method so that it works with SemVer. This change mainly addresses the version unmatching for codegen's caret version.
  
• Add codegen to nohoist of yarn workspace in order to be scanned by CLI in case of using yarn setup-dev and amplify-dev. Details: https://classic.yarnpkg.com/blog/2018/02/15/nohoist/

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

[codecov]

Codecov Report

Merging #6730 (990e8c7) into master (59d66fe) will decrease coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6730      +/-   ##
==========================================
- Coverage   56.84%   56.50%   -0.35%     
==========================================
  Files         487      430      -57     
  Lines       22076    21088     -988     
  Branches     4414     4223     -191     
==========================================
- Hits        12550    11916     -634     
+ Misses       8649     8370     -279     
+ Partials      877      802      -75     

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[github-actions]

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