Tests

Support customize completion api url via custom providers. #195

Job	Run time
graalvm-build	4m 31s
unit-test (ubuntu-22.04, 17)	26s
unit-test (windows-latest, 17)	43s
jvm-integration-test (windows-latest, 17)	49s
jvm-integration-test (ubuntu-22.04, 17)	36s
unit-test (macos-latest, 17)	1m 16s
jvm-integration-test (macos-latest, 17)	1m 12s
graalvm-integration-test	13s
	9m 46s

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