GH-79 Copy and delete performance

Description

Copy & Delete now return a specific status code based on resulting state:

204 if the operation is complete
206 if there is more to process.

Copy Operation will return a list of remaining Keys that need to be updated. If present, will not query system again, will just operate on the list. If still more remain after sub-process limit is reached, repeat the call via client.

Delete operation can simply be called again and again until a 204 response is returned.

Related Issue

Fixes #79

How Has This Been Tested?

Added unit tests, also added functional/integration test as expected by browser.

Screenshots (if appropriate):

Types of changes

[ ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

[x] I have signed the Adobe Open Source CLA.
[x] My code follows the code style of this project.
[x] My change requires a change to the documentation.
[ ] I have updated the documentation accordingly.
[x] I have read the CONTRIBUTING document.
[x] I have added tests to cover my changes.
[x] All new and existing tests passed.

Codecov Report

Attention: Patch coverage is 86.56716% with 9 lines in your changes missing coverage. Please review.

Project coverage is 56.15%. Comparing base (e407d91) to head (926cab1).

Files with missing lines	Patch %	Lines
src/helpers/copy.js	0.00%	5 Missing :warning:
src/storage/object/delete.js	88.57%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #90 +/- ## ========================================== + Coverage 53.64% 56.15% +2.50% ========================================== Files 38 38 Lines 1795 1820 +25 ========================================== + Hits 963 1022 +59 + Misses 832 798 -34 ```

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adobe / da-admin