Add new ContainerHandlerBuilder

[sapessi]

• Framework version: 1.2
• Implementations: Jersey / Spring / Spring Boot / Spark

Scenario

To make it easier to customize the configuration of a container handler, we should add an additional builder object that developers can use to pass all necessary configuration parameters in the static block of their code

Expected behavior

SpringLambdaContainerHandler handler = HandlerBuilder.register("my.class").
                  defaultContainerConfig().springProfiles("profile-1").build();

[sapessi]

Release 1.4 is out on maven central. The release notes include a list of all the changes. Closing this issue.