Add an heuristic to detect fully encrypted flows #2860

Job	Run time
Python Bindings (ubuntu-latest)	1m 18s
ubuntu-latest x86_64 --with-local-libgcrypt cc	7m 9s
ubuntu-latest x86_64 cc	9m 59s
ubuntu-20.04 x86_64 --with-local-libgcrypt cc	7m 51s
ubuntu-20.04 x86_64 cc	6m 59s
macOS-latest x86_64 --with-local-libgcrypt cc	6m 2s
macOS-latest x86_64 cc	6m 38s
macos-11 x86_64 --with-local-libgcrypt cc	7m 17s
macos-11 x86_64 cc	6m 41s
windows-latest x86_64 --with-local-libgcrypt cc	21m 46s
windows-latest x86_64 cc	10m 54s
ubuntu-20.04 x86_64 gcc-7 --with-pcre --with-maxminddb --with-sanitizer	23m 24s
ubuntu-22.04 x86_64 gcc-12 --with-pcre --with-maxminddb --with-sanitizer --with-lto-and-gold-linker	20m 32s
ubuntu-20.04 x86_64 clang-7 --with-pcre --with-maxminddb --with-sanitizer	23m 10s
ubuntu-22.04 x86_64 clang-14 --with-pcre --with-maxminddb --with-sanitizer --with-lto-and-gold-linker	31m 58s
ubuntu-latest x86_64 cc --with-pcre --with-maxminddb --with-thread-sanitizer	1h 2m 23s
ubuntu-latest x86_64 cc --with-pcre --with-maxminddb --with-sanitizer nBPF	15m 31s
ubuntu-22.04 x86_64 clang-14 --with-pcre --with-maxminddb --with-memory-sanitizer	56m 14s
macOS-latest x86_64 cc --with-pcre --with-maxminddb	7m 0s
macos-12 x86_64 cc --with-pcre --with-maxminddb	6m 50s
ubuntu-latest arm64 cc --with-pcre --with-maxminddb	38m 13s
ubuntu-latest armhf cc --with-pcre --with-maxminddb --with-sanitizer	1h 38m 49s
ubuntu-latest s390x cc --with-pcre --with-maxminddb	32m 9s
Test Utils (ubuntu-latest)	3m 29s
	8h 32m 16s

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