Refactor Files class into proper classes

[pem70]

What It Does
Refactor files.py into separate files. Class Files will be supported still, and each module can run independently.

How to Test

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov]

Codecov Report

Attention: Patch coverage is 70.95116% with 113 lines in your changes missing coverage. Please review.

Project coverage is 86.54%. Comparing base (5816aab) to head (ed5fde7).
Report is 230 commits behind head on main.

Files with missing lines	Patch %	Lines
.../zos_files/zowe/zos_files_for_zowe_sdk/datasets.py	71.96%	60 Missing ⚠️
src/zos_files/zowe/zos_files_for_zowe_sdk/uss.py	40.00%	36 Missing ⚠️
src/zos_files/zowe/zos_files_for_zowe_sdk/files.py	61.36%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #274      +/-   ##
==========================================
+ Coverage   86.21%   86.54%   +0.33%     
==========================================
  Files          35       38       +3     
  Lines        2292     2386      +94     
==========================================
+ Hits         1976     2065      +89     
- Misses        316      321       +5     

Flag	Coverage Δ
unittests	86.54% <70.95%> (+0.33%)	⬆️

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[traeok]

LGTM @pem70 thanks for splitting these up into classes and updating the deprecated functions! 👍
I see that the patch coverage is a bit below the 80% minimum, but no worries about this as the other pull request is related and implements more patch coverage for that work 😋

[zFernand0]

Changes LGTM! 😋
I like the direction that was taken with the refactoring.
Left two minor comments, both of which can be addressed in a new PR that combines all 3 issues:

• [chore]: Refactor files and jobs into proper folders #264
• [tests]: Organize tests based on the source structure #265
• [zos-files] upload_file_to_dsn does not convert Windows line endings #104

[zFernand0]

Closing in favor of the next PR in line:

• Organize testing #275