migrate from catch2v2 to catch2v3 and implement VisorTest helper lib … #146

Job	Run time
pktvisor (x86_64, x86_64, http://musl.cc/x86_64-linux-musl-cross.tgz, x86_64-linux-musl-gcc, x86_...	21m 51s
pktvisor (armv7lh, armv7hf, http://musl.cc/armv7l-linux-musleabihf-cross.tgz, armv7l-linux-muslea...	20m 40s
pktvisor-cli (linux, x86_64)	1m 3s
pktvisor (aarch64, armv8, http://musl.cc/aarch64-linux-musl-cross.tgz, aarch64-linux-musl-gcc, aa...	26m 39s
pktvisor-cli (linux, armv7lh)	1m 30s
pktvisor-cli (linux, aarch64)	1m 29s
pktvisor-cli (macos, x86_64)	1m 22s
pktvisor-cli (macos, aarch64)	1m 9s
	1h 15m 43s

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