Consider increasing maximum Bloom filter size beyond its current 1 byte

[michaelklishin]

Currently the maximum supported Bloom filter size is limited to just one byte. There are a few more bytes available in the chunk header, so perhaps using e.g. 4 bytes would make a practical difference for some RabbitMQ Streams users.

See https://github.com/rabbitmq/osiris/discussions/164 for background.