Add support for extensions loading and creation. #538

Job	Run time
Check distgen generated files	17s
Container tests: 10 - fedora	5s
Container tests: 10 - rhel8	32m 56s
Container tests: 10 - rhel9	4s
Container tests: 10 - c9s	3s
Container tests: 11 - fedora	7s
Container tests: 11 - rhel8	6s
Container tests: 11 - rhel9	7s
Container tests: 11 - c9s	6s
Container tests: 12 - fedora	20m 20s
Container tests: 12 - rhel8	32m 45s
Container tests: 12 - rhel9	6s
Container tests: 12 - c9s	3s
Container tests: 13 - fedora	20m 21s
Container tests: 13 - rhel8	34m 15s
Container tests: 13 - rhel9	29m 54s
Container tests: 13 - c9s	20m 19s
Container tests: 14 - fedora	20m 19s
Container tests: 14 - rhel8	6s
Container tests: 14 - rhel9	3s
Container tests: 14 - c9s	6s
Container tests: 15 - fedora	21m 13s
Container tests: 15 - rhel8	33m 24s
Container tests: 15 - rhel9	31m 15s
Container tests: 15 - c9s	3h 7m 33s
Container tests: 16 - fedora	20m 11s
Container tests: 16 - rhel8	35m 16s
Container tests: 16 - rhel9	31m 15s
Container tests: 16 - c9s	3h 7m 5s
	12h 39m 40s

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