feat: add communication on gradio(pre-demo)

[longxiaofei]

support pygwalker use duckdb in gradio.

Just a pre-release demo version, Communication won't work when gradio is reloaded (to be fixed).

import gradio as gr
import pandas as pd

from pygwalker.api.gradio import PYGWALKER_ROUTE, get_html_on_gradio

with gr.Blocks() as demo:
    df = pd.read_csv("xxx.csv")
    pyg_html = get_html_on_gradio(df, spec="gw_config.json", debug=True)
    gr.HTML(pyg_html)


app = demo.launch(app_kwargs={
    "routes": [PYGWALKER_ROUTE]
})