docs: PDBDebugger and Parallelizable

[zilto]

It should be noted the PDBDebugger doesn't work with parallel and multithreaded task-based execution. However, you can use it in combination with the SynchronousLocalTaskExecutor

import my_dataflow
from hamilton import driver
from hamilton.execution.executors import SynchronousLocalTaskExecutors
from hamilton.lifecycle import PDBDebugger

dr = (
  driver.Builder()
  .enable_dynamic_execution(allow_experimental_mode=True)
  .with_modules(my_dataflow)
  .with_adapters(PDBDebugger(...))
  .with_remote_executor(SynchronousLocalTaskExecutor())
  .build()
)

dr.execute(...)

[elijahbenizzy]

It should work with threading, in theory, but it will usually provide a really annoying experience.