clean up utils and shared code

[lowlydba]

Description

Clean up utils and shared code.

• Utilize #Requires for PowerShell module dependency management
• Move TypeArray fix into shared util
• Return instance and creds from credential function

How Has This Been Tested?

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue) - Fixes #
• [ ] New feature (non-breaking change which adds functionality)

Checklist:

• [x] I have read/followed the CONTRIBUTING document.
• [x] I have read/followed the PR Quick Start Guide # TODO: update with link to published doc
• [x] I have added tests to cover my changes or they are N/A.
• [ ] New module options/parameters include a version_added property.

[codecov-commenter]

Codecov Report

Merging #48 (c4ea435) into main (613dbde) will decrease coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   94.97%   94.93%   -0.04%     
==========================================
  Files          33       33              
  Lines        1014      988      -26     
==========================================
- Hits          963      938      -25     
+ Misses         51       50       -1     

Impacted Files	Coverage Δ
plugins/module_utils/_SqlServerUtils.psm1	95.65% <100.00%> (+2.31%)	:arrow_up:
plugins/modules/agent_job.ps1	95.83% <100.00%> (-0.12%)	:arrow_down:
plugins/modules/agent_job_category.ps1	94.44% <100.00%> (-0.30%)	:arrow_down:
plugins/modules/agent_job_schedule.ps1	96.70% <100.00%> (-0.08%)	:arrow_down:
plugins/modules/agent_job_step.ps1	97.75% <100.00%> (-0.05%)	:arrow_down:
plugins/modules/database.ps1	84.89% <100.00%> (-0.22%)	:arrow_down:
plugins/modules/login.ps1	96.25% <100.00%> (-0.10%)	:arrow_down:
plugins/modules/maintenance_solution.ps1	94.11% <100.00%> (-0.17%)	:arrow_down:
plugins/modules/memory.ps1	95.83% <100.00%> (-0.33%)	:arrow_down:
plugins/modules/nonquery.ps1	96.29% <100.00%> (-0.26%)	:arrow_down:
... and 21 more

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[lowlydba]

Windows 2022 basically times out with

An error occurred while provisioning resources (Error Type: Disconnect).

Presumably this is an error on the infra side, so moving back to 2019 for the time being.