feat: changes for native packaging

[edwardfoyle]

The following are some workarounds required to package the CLI using pkg

• esm is not supported
• fs.copyFile and fs.copyFileSync are not supported
• An additional directory in the snapshot filesystem needs to be scanned for plugins

There are a couple other changes needed to the CLI to support packaging, but in the spirit of keeping PRs small, I'm publishing this one.

Also note, all of the changes in functionality in this PR are behind and "isPackaged" check which is only true when the CLI is running as a packaged binary. There are no changes in functionality when the CLI is running in Node

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 #5548 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5548   +/-   ##
=======================================
  Coverage   59.08%   59.09%           
=======================================
  Files         402      403    +1     
  Lines       18043    18045    +2     
  Branches     3575     3575           
=======================================
+ Hits        10661    10663    +2     
  Misses       6723     6723           
  Partials      659      659           

Impacted Files	Coverage Δ
packages/amplify-cli/src/domain/constants.ts	100.00% <ø> (ø)
packages/amplify-cli-core/src/index.ts	100.00% <100.00%> (ø)
packages/amplify-cli-core/src/isPackaged.ts	100.00% <100.00%> (ø)

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[attilah]

LGTM, one nit

[github-actions]

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