feat: reactive_task decorator (re)runs a task when a dependency changes

[maartenbreddels]

Dependencies are other reactive variables.

Examples:

import asyncio
import time
import solara
from solara.lab import reactive_task

x = solara.reactive(2)

@reactive_task
async def x_square():
    await asyncio.sleep(2)
    a = b
    return x.value**2

@solara.component
def Page():
    solara.SliderInt("x", value=x, min=0, max=10)
    if x_square.value.state == solara.ResultState.FINISHED:
        solara.Text(repr(x_square.value.value))
    solara.ProgressLinear(x_square.value.state == solara.ResultState.RUNNING)

[maartenbreddels]

• feat: run side effects when reactive variable change #474
• feat: reactive_task decorator (re)runs a task when a dependency changes #473 👈
• feat: task and use_task for better asyncio task a thread execution #461 : 1 other dependent PR (#494 )
• feat: computed reactive variables #455
• feat: on_kernel_start triggers callback on virtual kernel start #471 : 1 other dependent PR (#452 )
• master

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