package/fluent-bit: add new package

Fluent Bit is a super fast, lightweight, and highly
scalable logging and metrics processor and forwarder.

Signed-off-by: Thomas Devoogdt <thomas.devoogdt@barco.com>
[Peter: add DEVELOPERS entry, drop STATIC_LIBS dependency]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>