Add hooks for extensiona, allow custom Table-AM to implement custom x… #590

Job	Run time
check-skip	1s
Build Apache Cloudberry	9m 23s
prepare-test-matrix	1s
RPM Install Test Apache Cloudberry	34s
ic-good-opt-off	24m 45s
ic-good-opt-on	30m 2s
ic-expandshrink	3m 6s
ic-singlenode	6m 46s
ic-resgroup-v2	18m 31s
ic-contrib	2m 27s
ic-gpcontrib	2m 42s
ic-fixme	1m 55s
ic-isolation2	22m 58s
ic-isolation2-crash	3m 5s
ic-parallel-retrieve-cursor	2m 41s
Generate Apache Cloudberry Build Report	1s
	2h 8m 58s

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