chore: Add transform test creation script

[GavinZZ]

Issue #, if available

Description of changes

Added a script to allow easier transform tests creation.

Description of how you validated changes

Verified by manual trigger.

Tested with and without --disable-api-configuration, work as expected.
Tested with arn:aws..., work as expected.

Not affecting SAM T functionality.

[hoffa]

[xazhao]

A general question: If we use the script to create transform tests, we use translated templates to compare with translated templates which will for sure succeed. Are we supposed to write output templates on ourselves so we can make sure it's expected?

On the other hand, if it is to test if Sam-T functionality has changed, I think this method makes sense.

[hoffa]

A general question: If we use the script to create transform tests, we use translated templates to compare with translated templates which will for sure succeed. Are we supposed to write output templates on ourselves so we can make sure it's expected?

On the other hand, if it is to test if Sam-T functionality has changed, I think this method makes sense.

We should always verify the output is as we expect. The tool only makes the step of generating it easier.

[GavinZZ]

To answer Xia's question, I think this script just makes our live easier. We will still need to manually verify the output to make sure it's what we expect.

[xazhao]

Oh makes sense to me then! Could we add this to development guide too?

[GavinZZ]

Will add a message at the end to let users to check output manually.