DnsRecordNs: Implemented as a class-based resource

[Sudman1]

Pull Request (PR) description

Implements a class-based solution for managing NS records - to include implementation of managing scoped records.

This Pull Request (PR) fixes the following issues

• Fixes DnsRecordNs: New resource proposal #153

Task list

• Added an entry to the change log under the Unreleased section of the
  file CHANGELOG.md. Entry should say what was changed and how that
  affects users (if applicable), and reference the issue being resolved
  (if applicable).
• Resource documentation added/updated in README.md.
• Resource parameter descriptions added/updated in README.md, schema.mof
  and comment-based help. Does not use schema.mof file. Parameter Descriptions not updated in the README.md, as that has moved to the Wiki.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Community Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• New/changed code adheres to DSC Community Style Guidelines.

---

This change is 

[codecov]

Codecov Report

Merging #254 (b529d3d) into main (97f6ef7) will increase coverage by 0%.
The diff coverage is 100%.

@@         Coverage Diff         @@
##           main   #254   +/-   ##
===================================
  Coverage    90%    91%           
===================================
  Files        36     38    +2     
  Lines      1476   1546   +70     
===================================
+ Hits       1337   1407   +70     
  Misses      139    139           

Impacted Files	Coverage Δ
source/Classes/003.DnsRecordMx.ps1	100% <ø> (ø)
source/Private/Get-LocalizedDataRecursive.ps1	100% <ø> (ø)
source/Classes/003.DnsRecordNs.ps1	100% <100%> (ø)
source/Classes/004.DnsRecordNsScoped.ps1	100% <100%> (ø)

[johlju]

Reviewed 19 of 20 files at r1, 1 of 1 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Sudman1)

[johlju]

@Sudman1 Awesome!