Add SmithyModelExtensions and KebabCase method

[options]

No description provided.

[Copilot]

Pull Request Overview

This pull request introduces new helper methods for both model shapes and naming conversions.

• Added two shape retrieval extension methods in SmithyModelExtensions.cs.
• Introduced a new KebabCase method in NamingUtils.cs to convert strings to kebab-case.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
Smithy.Model/SmithyModelExtensions.cs	Adds GetShape and GetShape extension methods for retrieving shapes.
Smithy.CSharpGenerator/Utils/NamingUtils.cs	Updates formatting in PascalCase and adds a new KebabCase method for string conversion.

[Copilot]

[nitpick] Consider enhancing the KebabCase method to better handle sequences of uppercase letters (e.g., abbreviations like 'XMLHttpRequest') to ensure consistent and expected output, or document the current behavior clearly.

Suggested change

	for (int i = 0; i < id.Length; i++)
	{
	if (i > 0 && char.IsUpper(id[i]))
	{
	sb.Append('-');
	}
	bool previousWasUpper = false;
	for (int i = 0; i < id.Length; i++)
	{
	if (char.IsUpper(id[i]))
	{
	if (i > 0 && !previousWasUpper)
	{
	sb.Append('-');
	}
	previousWasUpper = true;
	}
	else
	{
	previousWasUpper = false;
	}