[Suggestion] Add functionality for reading a retriever until the end of the file (Unknown length)

[KSneijders]

Add a way to the Retriever constructor to allow the repeat to increase until the end of the file is reached.
This is (for example) useful in log files where strings are pushed without knowing how many have been pushed in total. One would be able to do something like:

class LogFile(BaseStruct):
    logs: list[str] = Retriever(str32, default="", repeat_until_eof=True)

logfile = LogFile._from_file(path)

for line in logfile.logs:
    print(line)

[Divy1211]

This would indeed be nice to have, but some experimentation is required to figure out a good way to do this