e4463b11af
Replace usages of `boost::algorithm::join()` with `fmt::join()` to improve performance and reduce dependency on Boost. `fmt::join()` allows direct formatting of ranges and tuples with custom separators without creating intermediate strings. When formatting comma-separated values into another string, fmt::join() avoids the overhead of temporary string creation that `boost::algorithm::join()` requires. This change also helps streamline our dependencies by leveraging the existing fmt library instead of Boost.Algorithm. To avoid the ambiguity, some caller sites were updated to call `seastar::format()` explicitly. See also - boost::algorithm::join(): https://www.boost.org/doc/libs/1_87_0/doc/html/string_algo/reference.html#doxygen.join_8hpp - fmt::join(): https://fmt.dev/11.0/api/#ranges-api Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#22082