NodeDriver Extension for JUnit5

Sample RPC test using NodeDriverNetworkExtension:

/** Sample test using [NodeDriverNetworkExtension] */
@ExtendWith(NodeDriverNetworkExtension::class)
class NodeDriverNetworkExtensionTest {

    companion object {

        // Marks the field
        // as a config for the extension
        @NodeDriverExtensionConfig
        @JvmStatic
        val nodeDriverConfig: NodeDriverNodesConfig =
                SimpleNodeDriverNodesConfig (
                        // Optional, used *only* for the current  
                        // Gradle module, if a cordapp.
                        cordappProjectPackage = SampleCordapp::class.java.`package`.name,
                        // Optional; package names are used to pickup  
                        // cordapp or cordaCompile dependencies
                        cordappPackages = listOf<String>(PartitureFlow::class.java.`package`.name),
                        // Specify Cordapp Configs per package, 
                        // alternatively use a ${cordappPackage}.config.properties file 
                        // in the classpath i.e. test/resources 
                        cordappPackageConfigs = mapOf(
                                SampleCordapp::class.java.`package`.name tp mapOf("foo" to "bar")
                        ),
                        // Add nodes
                        nodes = mapOf("partya" to ALICE_NAME.toNodeParams(), "partyb" to BOB_NAME.toNodeParams()),
                        // All bellow are optional/defaults
                        notarySpec = TestNotaryProperties(),
                        flowOverrides = emptyList(),
                        poolParams = PoolParams(),
                        minimumPlatformVersion = 5,
                        debug = false
                    )
    }

    // The extension implements a ParameterResolver
    // for NodeHandles
    @Test
    fun `Can retrieve node identity`(nodeHandles: NodeHandles) {
        val nodeA: NodeHandle = nodeHandles.getNode("partya")
        assertTrue(nodeA.nodeInfo.legalIdentities.isNotEmpty())
    }
}