feat(sdk): custom assertions #1301

Job	Run time
Validate PR title	3s
mavenverify	2m 38s
platform-integration	6m 14s
platform-xtest / resolve-versions	11s
platform-xtest / xct (main, java)	27m 8s
platform-xtest / xct (main, js)	17m 47s
platform-xtest / xct (v0.4.34, js)	8m 53s
platform-xtest / xct (main, go)	21m 13s
platform-xtest / xct (v0.4.34, java)	11m 51s
platform-xtest / xct (v0.4.34, go)	8m 51s
platform-xtest / xtest	4s
platform-xtest / publish-results	5s
ci	4s
	1h 45m 2s

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