Changes to the cache file are collected in a write buffer and written in
one transaction when the buffer reaches buffer_size, when the OOM killer
releases memory, or when sing-box is closed. An optional flush_interval
writes the buffer periodically. Previously each DNS response, RDRC entry
and FakeIP mapping was committed in its own transaction.
Also open the database with NoFreelistSync, and mark store_rdrc and
rdrc_timeout as deprecated in the options.
- Remove `bbr_standard`, `bbr2` and `bbr2_variant` from the naive inbound
- Report injected congestion controllers with connection-wide packet numbers in quic-go
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