Fix a spell miss of AWS adapter intro documentation

Aligned ApplicationJsonMessageMarshallingConverter with the same from s-c-Stream

Resolves #451

Fix typos

Fixed  logic to ensure that for cases where user may return a Message with no contentType set, the property-set content type is propagated

This reverts commit baf7e5fa.

This reverts commit 669e8eaa.

This reverts commit d6affef1.

This reverts commit 8e8df420.

Resolves #448

For now an undocumented feature as it may need some more work

Resolves #449

The regression was caused by filtering main classes that are @SpringVootApplication only, essentially excluding @SpringBootConfiguration

Resolves #439

Given that function can be looked up with no definition, the fallback alternative should be 'spring.cloud.function.definition' property

Resolves #444

Tagging @marcingrzejszczak

Resolves #445

function-sample-azure cleanup

Added initila support for Application Load Balancer request and response events. This support for now is only protocol based (see https://docs.aws.amazon.com/elasticloadbalancing/latest/application/lambda-functions.html#respond-to-load-balancer)
Added initial tests

Resolves #438