Add @ServiceConnection support.

[maciejwalkowiak]

Fixes #793.

Added support for @ServiceConnection on LocalstackContainer.

@SpringBootTest
class AppTest {

	@TestConfiguration
	static class AppConfiguration {

		@Bean
		@ServiceConnection
		LocalStackContainer localStackContainer() {
			return new LocalStackContainer(DockerImageName.parse("localstack/localstack:3.2.0"));
		}
	}

        // all clients are automatically configured to connect to LocalStack container
}

[MatejNedic]

Looks awesome can't wait to use it :) !

[sonarqubecloud]

Quality Gate failed

Failed conditions
74.2% Coverage on New Code (required ≥ 80%)
B Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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