plugin-flow-builder: create executeConversationStart #BLT-1259

[Iru89]

Description

Create executeConversationStart to allow handoffs and bot actions in typical WelcomeAction.

Context

If in a WelcomeAction you get the contents connected to the Conversation Start using

const contents = pluginFlowBuilder.getStartContents()

but you do not execute the FlowBuilderAction.botonicInit(request, contentID) where contentID is contents[0].code neither the handoffs nor the bot actions are executed.

To document / Usage example

Now you can write WelcomeAction as:

export class WelcomeAction extends FlowBuilderMultichannelAction {
  static contextType = RequestContext
  static async botonicInit(
    request: BotRequest
  ): Promise<FlowBuilderActionProps> {

   //extra logic

    return await super.executeConversationStart(request)
  }
}