Kefu Chai 618091f6f7 streaming: add fmt::formatter for stream_session_state ...

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, we define formatters for
`streaming::stream_session_state`, and drop its operator<<

Refs #13245

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

2024-02-22 14:03:59 +08:00

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