fix: recursive file joiner read

[notanatol]

SWA-01-010 WP2: Unbounded recursion in file joiner (Medium)

While reviewing the file joiner implementation, it was found that the code allows for an
unbounded recursive call.

This change is 

[mrekucci]

Reviewed 2 of 2 files at r1, 2 of 2 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @notanatol)

---

pkg/file/joiner/joiner.go, line 93 at r3 (raw file):

}

var ErrMalformedTrie = errors.New("subtrie span is over the limit")

I'd suggest renaming the error to reflect more the cause, something like ErrSubtrieSpanLimitExceeded or something similar.

[sonarqubecloud]

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