Kefu Chai f3532cbaa0 db: commitlog: use fmt::streamed() to print segment ...

before this change, we rely on the default-generated fmt::formatter
created from operator<<, but fmt v10 dropped the default-generated
formatter.

in this change:

* add `format_as()` for `segment` so we can use it as a fallback
  after upgrading to {fmt} v10
* use fmt::streamed() when formatting `segment`, this will be used
  the intermediate solution before {fmt} v10 after dropping
  `FMT_DEPRECATED_OSTREAM` macro

Refs #13245

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

Closes scylladb/scylladb#18019

2024-03-26 12:13:29 +02:00

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