refactor(cli): organize code that should only be used by the CLI into a folder

[mrgrain]

Reason for this change

This PR is separating the code that should only be used by the CLI into a specific folder.
It's currently quite hard to reason about the existing api code as its spread across many files and deep subpath imports.
The change deliberately gives up on potential feature reusability of some helpers in order to create locality.

Similar to #33094

Description of changes

Collating existing files and APIs that should only be used by the CLI into a new cli folder.
Updated imports accordingly.
No functional changes.

Describe any new or updated permissions being added

n/a

Description of how you validated changes

exiting tests

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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

[aws-cdk-automation]

(This review is outdated)

[codecov]

Codecov Report

Attention: Patch coverage is 86.91275% with 39 lines in your changes missing coverage. Please review.

Project coverage is 80.77%. Comparing base (7329068) to head (0073482).

❌ Your patch check has failed because the patch coverage (86.91%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #33138      +/-   ##
==========================================
- Coverage   81.57%   80.77%   -0.80%     
==========================================
  Files         227      232       +5     
  Lines       13793    14110     +317     
  Branches     2419     2453      +34     
==========================================
+ Hits        11251    11398     +147     
- Misses       2270     2432     +162     
- Partials      272      280       +8     

Flag	Coverage Δ
suite.unit	80.77% <86.91%> (-0.80%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	79.50% <86.91%> (-1.49%)	⬇️
packages/aws-cdk-lib/core	82.17% <ø> (ø)

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[aws-cdk-automation]

➡️ PR build request submitted to test-main-pipeline ⬅️

A maintainer must now check the pipeline and add the pr-linter/cli-integ-tested label once the pipeline succeeds.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0073482
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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