fix(core): cfn-parse does not support this new CFN function -- AccountIdFromAlias

[YYang30]

Reason for this change:

• AWS CloudFormation team introduced a new intrinsic function -- AccountIdFromAlias which resolves an aws account alias to its account id during stack operation. This is a preferred way for referencing to an AWS account ID in cloud formation templates. So that we can get rid of hardcoding account-IDs in templates and then automate the region build process.
• However, AccountIdFromAlias has not yet been added to core/lib/cfn-parse module, as a result of which, cfn-include would fail to import a cloud formation template if it contains the usage of this function.

Solution:

• Added a new class for this function -- AccountIdFromAlias and updated the logic in cfn-parse so that cfn-parse can recognize it as a valid function.

fixes #27642

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