feat(sdk): custom assertions #1291

Job	Run time
Validate PR title	3s
mavenverify	2m 29s
platform-integration	6m 6s
platform-xtest / resolve-versions	14s
platform-xtest / xct (main, java)	26m 49s
platform-xtest / xct (main, go)	19m 12s
platform-xtest / xct (main, js)	18m 17s
platform-xtest / xct (v0.4.34, java)	13m 21s
platform-xtest / xct (v0.4.34, go)	9m 40s
platform-xtest / xct (v0.4.34, js)	9m 58s
platform-xtest / xtest	3s
platform-xtest / publish-results	3s
ci	4s
	1h 46m 19s

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