feat: add support for JSONPath testcases

[gchiesa]

🎯 What

Provide a concise description of the changes:

• ❓ What changes have you made? (High-level overview)
  Implemented support for multiple TestCase analyzing the plan with JsonPath queryes

• 🎉 What does it mean to the user? (In plain English)

User can run some tests with the following model:

//[...]
tc := []scenario.JsonPathTestCases{
		{
			TestName:           "isIRSA",
			JsonPathToCompare:  "{$.planned_values.outputs.is_irsa.value}",
			ExpectedValue:      false,
			TestType:           scenario.ShouldBeEqual,
			AllowDifferentType: false,
		},
		{
			TestName:           "isPodIdentity",
			JsonPathToCompare:  "{$.planned_values.outputs.is_pod_identity.value}",
			ExpectedValue:      true,
			TestType:           scenario.ShouldBeEqual,
			AllowDifferentType: false,
		},
}
s.Stg.PlanAndAssertJsonWithJsonPath(t, s.GetTerraformOptions(), tc)

[Excoriate]

Thanks so much for this nice contribution. It's indeed a great addition to the library! I left small comments for your revision.