c7fe5d7f94
Right now, the function allows for passing the path to a file as a seastar::sstring, which is then converted to std::filesystem::path -- implicitly to the caller. However, the function performs I/O, and there is no reason to accept any other type than std::filesystem::path, especially because the conversion is straightforward. Callers can perform it on their own. This commit introduces the more constrained API. Closes #15266