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this is a part of a series to migrating from `operator<<(ostream&, ..)` based formatting to fmtlib based formatting. the goal here is to enable fmtlib to print `cdc::generation_id` and `db_clock::time_point` without the help of `operator<<`. the formatter of `cdc::generation_id` uses that of `db_clock::time_point` , so these two commits are posted together in a single pull request. the corresponding `operator<<()` is removed in this change, as all its callers are now using fmtlib for formatting now. Refs #13245 Closes #13703 * github.com:scylladb/scylladb: db_clock: specialize fmt::formatter<db_clock::time_point> cdc: generation: specialize fmt::formatter<generation_id>