Introduce a new static class `SignatureDtoExtensions` that adds
a `Convert<T>` extension method for collections of `SignatureDto`
objects. This method converts all `SignatureDto` instances in a
collection to a specified `UnitOfLength`, modifying them in place
and returning the same collection.
The method includes:
- A generic constraint to support any `IEnumerable<SignatureDto>`.
- Null checks to ensure the collection is not null.
- Comprehensive XML documentation with usage examples and notes.
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