SqlServerDsc: Add new issues templates

[johlju]

Pull Request (PR) description

• SqlServerDsc
  • New GitHub issue templates for proposing new public commands, proposing an enhancement to an existing command, or having a problem with an existing command.

This Pull Request (PR) fixes the following issues

None.

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).
• [ ] Resource documentation updated in the resource's README.md.
• [ ] Resource parameter descriptions updated in schema.mof.
• [ ] Comment-based help updated, including parameter descriptions.
• [ ] Localization strings updated.
• [ ] Examples updated.
• [ ] Unit tests updated. See DSC Community Testing Guidelines.
• [ ] Integration tests updated (where possible). See DSC Community Testing Guidelines.
• [ ] Code changes adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #1799 (6a87f75) into main (1026d20) will not change coverage. The diff coverage is n/a.

@@         Coverage Diff          @@
##           main   #1799   +/-   ##
====================================
  Coverage    88%     88%           
====================================
  Files        83      83           
  Lines      7443    7443           
====================================
  Hits       6593    6593           
  Misses      850     850           

Flag	Coverage Δ
unit	88% <ø> (ø)