fix: Use a hashed id for default root name

[orgads]

When multiple packages are imported, and all of them were generated in a way that uses default as the root name, each imported package overwrites the definitions of the previous ones.

Solve by assigning a hashed (fallback) name to each generated package.

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• [X] Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea

• [X] Ensure the tests and linter pass

• [X] Code coverage does not decrease (if any source code was changed)

• [X] Appropriate docs were updated (if necessary)

• Relates to #1529 🦕

[orgads]

@sofisl

[sofisl]

/gcbrun