Make parameters alias to be lists instead of strings

[adityapatwardhan]

PR Summary

This pull request includes multiple changes to improve the handling of parameter aliases in the codebase. The most important changes involve modifying the Parameter class and related methods to use a list of strings for aliases instead of a single string.

Changes to Parameter class:

• src/Model/Parameter.cs: Changed the Aliases property from a string to a List<string> and updated constructors and methods accordingly. [1] [2] [3] [4] [5] [6] [7]

Updates to alias handling in methods:

• src/Common/YamlUtils.cs: Updated the GetParametersFromDictionary method to handle Aliases as a list of strings. [1] [2]
• src/Transform/TransformBase.cs: Modified methods to convert aliases to a list of strings. [1] [2]
• src/Transform/TransformMaml.cs: Adjusted the ReadParameter method to set aliases as a list of strings.

Test data updates:

• test/Pester/assets/get-date.yml: Updated test data to reflect the change in alias handling, representing aliases as lists instead of strings. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]

These changes ensure that the handling of parameter aliases is consistent and robust throughout the codebase.

PR Context

Fixes #712

[adityapatwardhan]

/azp run

[azure-pipelines]

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[sdwheeler]

Tested and pair reviewed with Aditya. LGTM