refine nioengine and swiftnio code, WIP
Merge branch '0.3.2.0' of https://github.com/intel-cloud/cosbench into 0.3.2.0
remove dependencies to httpcore 4.3
Merge branch '0.3.2.0' of https://github.com/intel-cloud/cosbench into 0.3.2.0

Conflicts:
	dev/cosbench-http/.classpath
add buffer