Added Public Function Test-IsNumericType

[hollanjs]

Pull Request (PR) description

Moved Test-IsNumericType from a private function in SqlServerDsc to a public function in DscResource.Common Original issue logged in SqlServerDsc by @johlju Issue #1795

This Pull Request (PR) fixes the following issues

• Fixes #87

Task list

• [x] 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).
• [x] Documentation added/updated in README.md.
• [ ] Comment-based help added/updated for all new/changed functions.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Examples appropriately added/updated.
• [x] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #88 (191d53e) into main (05e5294) will increase coverage by 0%. The diff coverage is 100%.

@@        Coverage Diff         @@
##           main   #88   +/-   ##
==================================
  Coverage    90%   91%           
==================================
  Files        28    29    +1     
  Lines       544   548    +4     
==================================
+ Hits        495   499    +4     
  Misses       49    49           

Impacted Files	Coverage Δ
source/Public/Test-IsNumericType.ps1	100% <100%> (ø)

[hollanjs]

Related SqlServerDsc PR #1823

[johlju]

@hollanjs thank you! 🙂