Add support for gradio for developing interactive web apps

[giswqs]

import ee
import gradio as gr
import geemap.foliumap as geemap

def viz_dem(vmin, vmax, palette):

    Map = geemap.Map()
    image = ee.Image('USGS/SRTMGL1_003')
    vis_params = {
        'min': vmin,
        'max': vmax,
        'palette': palette,
    }
    Map.addLayer(image, vis_params, 'SRTM')
    return Map.to_gradio()

vmin = gr.Number(value=0, label="Min value")
vmax = gr.Number(value=6000, label="Max value")
palette = gr.Textbox(value="terrain", label="Palette")
title = 'Visualize Earth Engine Data'
demo = gr.Interface(viz_dem, [vmin, vmax, palette], "html", title=title)
demo.launch()