Add automated acceptance tests for cmd_exec API #17

Job	Run time
python 3.6 macos-12	3m 15s
python 3.11 macos-12	3m 3s
java 8 macos-12	3m 52s
java 21 macos-12	4m 8s
php 5.3 macos-12	3m 33s
php 7.4 macos-12	3m 35s
php 8.3 macos-12	2m 57s
python 3.6 windows-2019	7m 9s
python 3.11 windows-2019	6m 48s
java 8 windows-2019	5m 45s
java 21 windows-2019	6m 24s
php 5.3 windows-2019	6m 13s
php 7.4 windows-2019	4m 31s
php 8.3 windows-2019	5m 16s
python 3.6 ubuntu-20.04	2m 1s
python 3.11 ubuntu-20.04	1m 56s
java 8 ubuntu-20.04	1m 27s
java 21 ubuntu-20.04	1m 30s
php 5.3 ubuntu-20.04	1m 32s
php 7.4 ubuntu-20.04	1m 26s
php 8.3 ubuntu-20.04	1m 47s
windows_meterpreter windows-2019	7m 47s
windows_meterpreter windows-2022	5m 43s
mettle macos-12	3m 30s
mettle ubuntu-20.04	1m 44s
Generate report	58s
	1h 37m 50s

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