fix(no-unsupported): fix node:test module

[MichaelDeBoey]

I've put the non-exported classes in here as well in case we would ever need them

Probably closes #377

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Out of scope for this PR as the class isn't exported, but I was wondering how we would handle the "extends node:stream's Readable class" in the case of TestsStream 🤔

TestsStream is only created in 16.19.0 & 18.9.0, but node:stream's Readable class is already existing way earlier.
For functionality that's present in node:stream's Readable class before 16.19.0 & 18.9.0 we should just use 16.19.0 & 18.9.0 in TestsStream I think?
And for functionality that's added to node:stream's Readable class after 16.19.0 & 18.9.0, we just keep the same values I think?

Since I wasn't sure, I kept the original value as a comment

Unfortunately this means that we would need to find some way of noticing ourselves that we need to update TestsStream whenever we update node:stream's Readable class

We will have the same problem with TestContext's assert property and all top-level functions from node:assert

[scagood]

A few initial thoughts 🤔, generally looks good!

[scagood]

Do you want to remove the excess comments before merging?

[MichaelDeBoey]

Do you want to remove the excess comments before merging?

@scagood You mean the types that aren't used?

As I said I my OP, I kept them for future reference if we ever need them