* Introduce high-level API for flows composition
For better end-user experience and more smooth integration logic
decomposition and distribution introduce an `IntegrationFlows.from(IntegrationFlow)`
to let to start the current flow from existing one.
On the other hand introduce an `BaseIntegrationFlowDefinition.to(IntegrationFlow)`
to let to continue the flow logic in the other existing one.
This way we can extract some templating logic into separate `IntegrationFlow` definitions
allowing at the same time to decompose a complex flow definition into logical reusable parts
* * Add more tests
* * Fix Checkstyle violation
* Add `@SuppressWarnings("overloads")` to new `from(IntegrationFlow)` and existing `from(Publisher)`.
Technically it does not make sense since `PublisherIntegrationFlow` is not a `public` class
* * Add docs
* Fix language in JavaDocs according review
* Fix language in the docs after review
Co-authored-by: Gary Russell <grussell@vmware.com>
Co-authored-by: Gary Russell <grussell@vmware.com>
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