fix: sync decorators

[Sobes76rus]

use case

@broker.task()
@validate_call()
async def task(arg1: str) -> None: ...

so, the thing is that pydantic's validator_call is syncronious decorator which returns awaitable future after call
right now receiver can't work with sync decorators on async functions

[Sobes76rus]

@s3rius all done as you suggested