Flow visualizer (#1375)

* Almost working!

* It fully works but not clean enought

* Working but not clean engouth

* Everything is workign

* WIP. Working on adding and & or to flows. In the middle of setting up template for flow as well

* template working

* Everything is working

* More changes and todos

* Add more support for @start

* Router working now

* minor tweak to

* minor tweak to conditions and event handling

* Update logs

* Too trigger happy with cleanup

* Added in Thiago fix

* Flow passing results again

* Working on docs.

* made more progress updates on docs

* Finished talking about controlling flows

* add flow output

* fixed flow output section

* add crews to flows section is looking good now

* more flow doc changes

* Update docs and add more examples

* drop visualizer

* save visualizer

* pyvis is beginning to work

* pyvis working

* it is working

* regular methods and triggers working. Need to work on router next.

* properly identifying router and router children nodes. Need to fix color

* children router working. Need to support loops

* curving cycles but need to add curve conditionals

* everythin is showing up properly need to fix curves

* all working. needs to be cleaned up

* adjust padding

* drop lib

* clean up prior to PR

* incorporate joao feedback

* final tweaks for joao

src/crewai/__init__.py

@@ -1,12 +1,13 @@
 import warnings
+
 from crewai.agent import Agent
 from crewai.crew import Crew
+from crewai.flow.flow import Flow
+from crewai.llm import LLM
 from crewai.pipeline import Pipeline
 from crewai.process import Process
 from crewai.routers import Router
 from crewai.task import Task
-from crewai.llm import LLM
-
 
 warnings.filterwarnings(
     "ignore",
@@ -15,4 +16,4 @@ warnings.filterwarnings(
     module="pydantic.main",
 )
 
-__all__ = ["Agent", "Crew", "Process", "Task", "Pipeline", "Router", "LLM"]
+__all__ = ["Agent", "Crew", "Process", "Task", "Pipeline", "Router", "LLM", "Flow"]