fix: optimize mock package imports

[edwardfoyle]

Issue #, if available:
#5103

Description of changes:
There were some circular imports when importing the mock package causing the import of that package to take ~5 seconds. This PR fixes these circular imports as well as migrates the command .js files to .ts files

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 #6455 (4f2384c) into master (e28035a) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #6455      +/-   ##
==========================================
- Coverage   57.30%   57.25%   -0.06%     
==========================================
  Files         474      479       +5     
  Lines       21669    21689      +20     
  Branches     4306     4310       +4     
==========================================
  Hits        12418    12418              
- Misses       8370     8390      +20     
  Partials      881      881              

Impacted Files	Coverage Δ
packages/amplify-cli-core/src/index.ts	94.73% <ø> (ø)
...es/amplify-util-mock/src/CFNParser/field-parser.ts	0.00% <0.00%> (ø)
packages/amplify-util-mock/src/CFNParser/index.ts	0.00% <ø> (ø)
...ages/amplify-util-mock/src/amplify-plugin-index.ts	0.00% <0.00%> (ø)
...ackages/amplify-util-mock/src/commands/mock/api.ts	0.00% <0.00%> (ø)
...es/amplify-util-mock/src/commands/mock/function.ts	0.00% <0.00%> (ø)
...ckages/amplify-util-mock/src/commands/mock/help.ts	0.00% <0.00%> (ø)
...ckages/amplify-util-mock/src/commands/mock/mock.ts	0.00% <0.00%> (ø)
...ges/amplify-util-mock/src/commands/mock/storage.ts	0.00% <0.00%> (ø)
packages/amplify-util-mock/src/index.ts	0.00% <ø> (ø)
... and 5 more

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[lgtm-com]

This pull request fixes 1 alert when merging 0bc9605 into 0530d1a - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class

[jhockett]

LGTM, just a couple of minor nits

[lgtm-com]

This pull request fixes 1 alert when merging 4f2384c into 75f5ace - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class

[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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