Generate Flow bean from Workflow file

[mcruzdev]

Changes

• Now when the workflow is loaded by a specification file, the identifiers table shows all the possible identifiers used for injecting a WorkflowDefinition or Flow class.
• Add a new build item for show all available identifiers FlowIdentifierBuildItem
• Now the extension's user can inject/execute a Workflow through Flow or WorkflowDefinition beans:

@Path("/echo")
public class EchoResource {

    @Inject
    @Identifier("io.quarkiverse.flow.generated.flow.EchoNameWorkflow")
    Flow flow;

    @Inject
    @Identifier("flow:echo-name")
    WorkflowDefinition workflowDefinition;
}

• Add a new property called quarkus.flow.definitions.namespace
• Add dev mode test to be sure that everything is working as expected (hot reload)
• Improve the documentation telling about the all possibilities for injecting/executing a workflow loaded by a specification file

Closes #87

[ricardozanini]

Looks nice, I'll take a better look early next week.

[ricardozanini]

@mcruzdev can you rebase? 😬

[ricardozanini]

@fjtirado mind also taking a look?

[ricardozanini]

@mcruzdev can you rebase?

[github-actions]

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