* INT-4570: Add MessageCollectionCallback for Mongo
JIRA: https://jira.spring.io/browse/INT-4570
The `MongoDbOutboundGateway` is intended to be used with the
`requestMessage` context, however using a plain `CollectionCallback`
we don't have access to the `requestMessage`
* Deprecate `CollectionCallback` usage in favor of newly introduced
`MessageCollectionCallback` and `message-collection-callback` for XML
**Cherry-pick to 5.0.x**
* * Remove `message-collection-callback` in favor of
`MessageCollectionCallback<T> extends CollectionCallback<T>`
* * Rename a new setter to `setMessageCollectionCallback()` to avoid
reflection collision
# Conflicts:
# spring-integration-mongodb/src/main/java/org/springframework/integration/mongodb/outbound/MongoDbOutboundGateway.java
# spring-integration-mongodb/src/test/java/org/springframework/integration/mongodb/config/MongoDbOutboundGatewayParserTests.java
# spring-integration-mongodb/src/test/java/org/springframework/integration/mongodb/dsl/MongoDbTests.java
# spring-integration-mongodb/src/test/java/org/springframework/integration/mongodb/outbound/MongoDbOutboundGatewayTests.java
# spring-integration-mongodb/src/test/java/org/springframework/integration/mongodb/rules/MongoDbAvailableTests.java
# src/reference/asciidoc/mongodb.adoc
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