Support ContextClassLoader when loading optional classes (#1995) #494

Job	Run time
build-and-verify (2.5, 8, ubuntu-latest)	7m 7s
build-and-verify (2.5, 11, ubuntu-latest)	4m 56s
build-and-verify (3.0, 8, ubuntu-latest)	6m 57s
build-and-verify (3.0, 11, ubuntu-latest)	5m 52s
build-and-verify (3.0, 17, ubuntu-latest)	4m 57s
build-and-verify (3.0, 21, ubuntu-latest)	4m 5s
build-and-verify (3.0, 22, ubuntu-latest)	3m 59s
build-and-verify (4.0, 8, ubuntu-latest)	7m 59s
build-and-verify (4.0, 11, ubuntu-latest)	6m 16s
build-and-verify (4.0, 17, ubuntu-latest)	5m 32s
build-and-verify (4.0, 21, ubuntu-latest)	4m 17s
build-and-verify (4.0, 22, ubuntu-latest)	4m 13s
build-and-verify (2.5, 8, windows-latest)	6m 58s
build-and-verify (3.0, 8, windows-latest)	6m 42s
build-and-verify (4.0, 8, windows-latest)	7m 26s
build-and-verify (2.5, 8, macos-latest)	3m 59s
build-and-verify (3.0, 8, macos-latest)	3m 52s
build-and-verify (4.0, 8, macos-latest)	5m 10s
release-spock	0s
publish-release-docs	0s
	1h 40m 17s

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