fix(stepfunctions-tasks): EvaluateExpression does not support Context parameters and whole State/Context parameter

[Hazzard17h]

Let use Context parameters within the expression:

new EvaluateExpression(scope, 'Get Exeuction Id', {
  expression: '`${$$.Execution.Id}`',
  resultPath: '$.executionId'
});

Fixes #14777

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Let use whole State/Context parameter within the expression:

new EvaluateExpression(scope, 'Id', {
  expression: '`${($).optional?.parameter ?? "Default"} ${($$).Task?.Token ?? "No token"}`',
  resultPath: '$.result'
});

This is useful to use optional chaining and/or nullish coalescing operator on properties that could be possibly unsetted, and referencing them directly will result in an error (eg: "The JSONPath ... could not be found in the input").

Fixes #20882

---

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