Standardize function names

[pem70]

What It Does Standardizes function names that datasets to be data_sets, sets unnecessary public variables to private. Addresses [#83]

How to Test

Review Checklist I certify that I have:

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

Additional Comments

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.25641% with 23 lines in your changes missing coverage. Please review.

Project coverage is 89.71%. Comparing base (ecf386c) to head (4c82137).

Files	Patch %	Lines
src/core/zowe/core_for_zowe_sdk/zosmf_profile.py	14.28%	6 Missing :warning:
src/core/zowe/core_for_zowe_sdk/profile_manager.py	79.16%	5 Missing :warning:
src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py	28.57%	5 Missing :warning:
src/zos_files/zowe/zos_files_for_zowe_sdk/uss.py	62.50%	3 Missing :warning:
src/core/zowe/core_for_zowe_sdk/request_handler.py	95.45%	1 Missing :warning:
...s_files/zowe/zos_files_for_zowe_sdk/file_system.py	83.33%	1 Missing :warning:
src/zos_tso/zowe/zos_tso_for_zowe_sdk/tso.py	75.00%	1 Missing :warning:
src/zosmf/zowe/zosmf_for_zowe_sdk/zosmf.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #300 +/- ## ========================================== - Coverage 89.72% 89.71% -0.02% ========================================== Files 53 53 Lines 2677 2674 -3 ========================================== - Hits 2402 2399 -3 Misses 275 275 ``` | [Flag](https://app.codecov.io/gh/zowe/zowe-client-python-sdk/pull/300/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zowe) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/zowe/zowe-client-python-sdk/pull/300/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zowe) | `89.71% <85.25%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zowe#carryforward-flags-in-the-pull-request-comment) to find out more.

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