New-SqlDscLogin: command to create SQL Server logins

[johlju]

Pull Request (PR) description

• New-SqlDscLogin
  • Added new public command to create a new login on a SQL Server Database
    Engine instance.
  • Supports creating SQL Server logins, Windows user logins, Windows group
    logins, certificate-based logins, and asymmetric key-based logins.

This Pull Request (PR) fixes the following issues

None.

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 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