Async wlgen API

Add an async wlgen API as an alternative to the phase tree

import operator
import functools

from lisa.platforms.platinfo import PlatformInfo
from lisa.wlgen.rta import RTAPhase, RTAConf, PeriodicWload, SleepWload

from lisa.wlgen.rta import Properties, task_factory

@task_factory
async def make_task(x):
    await PeriodicWload(duty_cycle_pct=10, period=16e-3, duration=1)

    async with Properties(uclamp=(1,10)):
        await SleepWload(duration=2)
        await PeriodicWload(duty_cycle_pct=20, period=1, duration=3)

    await PeriodicWload(duty_cycle_pct=30, period=1, duration=3)


def main():
    from lisa.utils import setup_logging
    import logging
    setup_logging()
    plat_info = PlatformInfo.from_yaml_map('./doc/traces/plat_info.yml')
    
    # Returns a factory 
    _phase = make_task(10)
    # Run the factory, provided some initial state parameters
    # for lisa.fuzz.Gen that is integrated with @task_factory
    phase = _phase(seed=42)
    print(phase)

    profile = {
        'task1': phase,
    }

    conf = RTAConf.from_profile(profile, plat_info=plat_info)
    print(conf.json)

main()