DMC env.id error containing multiple "_" separator

[belerico]

Running an experiment with a DMC environment like the following:

HYDRA_FULL_ERROR=1MUJOCO_GL=egl python sheeprl.py exp=dreamer_v3_dmc_walker_walk.yaml fabric.accelerator=gpu fabric.precision=bf16-mixed env.id=dmc_cartpole_swingup_sparse env.num_envs=1

raises the following error:

Error executing job with overrides: ['exp=dreamer_v3_dmc_walker_walk.yaml', 'fabric.accelerator=gpu', 'fabric.precision=bf16-mixed', 'env.id=dmc_cartpole_swingup_sparse', 'env.num_envs=1', 'buffer.size=2000000']
Traceback (most recent call last):
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/instantiate/_instantiate2.py", line 92, in _call_target
    return _target_(*args, **kwargs)
  File "/home/belerico/projects/sheeprl/sheeprl/envs/dmc.py", line 115, in __init__
    domain_name, task_name = id.split("_")
ValueError: too many values to unpack (expected 2)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/belerico/projects/sheeprl/sheeprl.py", line 4, in <module>
    run()
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/main.py", line 90, in decorated_main
    _run_hydra(
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/utils.py", line 394, in _run_hydra
    _run_app(
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/utils.py", line 457, in _run_app
    run_and_report(
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/utils.py", line 222, in run_and_report
    raise ex
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/utils.py", line 219, in run_and_report
    return func()
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/utils.py", line 458, in <lambda>
    lambda: hydra.run(
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/hydra.py", line 132, in run
    _ = ret.return_value
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/core/utils.py", line 260, in return_value
    raise self._return_value
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/core/utils.py", line 186, in run_job
    ret.return_value = task_function(task_cfg)
  File "/home/belerico/projects/sheeprl/sheeprl/cli.py", line 330, in run
    run_algorithm(cfg)
  File "/home/belerico/projects/sheeprl/sheeprl/cli.py", line 169, in run_algorithm
    fabric.launch(command, cfg, **kwargs)
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/lightning/fabric/fabric.py", line 839, in launch
    return self._wrap_and_launch(function, self, *args, **kwargs)
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/lightning/fabric/fabric.py", line 925, in _wrap_and_launch
    return to_run(*args, **kwargs)
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/lightning/fabric/fabric.py", line 930, in _wrap_with_setup
    return to_run(*args, **kwargs)
  File "/home/belerico/projects/sheeprl/sheeprl/algos/dreamer_v3/dreamer_v3.py", line 389, in main
    envs = vectorized_env(
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/gymnasium/vector/sync_vector_env.py", line 53, in __init__
    self.envs = [env_fn() for env_fn in env_fns]
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/gymnasium/vector/sync_vector_env.py", line 53, in <listcomp>
    self.envs = [env_fn() for env_fn in env_fns]
  File "/home/belerico/projects/sheeprl/sheeprl/envs/wrappers.py", line 83, in __init__
    super().__init__(self._env_fn())
  File "/home/belerico/projects/sheeprl/sheeprl/utils/env.py", line 72, in thunk
    env = hydra.utils.instantiate(cfg.env.wrapper, **instantiate_kwargs, _convert_="all")
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/instantiate/_instantiate2.py", line 226, in instantiate
    return instantiate_node(
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/instantiate/_instantiate2.py", line 347, in instantiate_node
    return _call_target(_target_, partial, args, kwargs, full_key)
  File "/home/belerico/miniconda3/envs/sheeprl-p10/lib/python3.10/site-packages/hydra/_internal/instantiate/_instantiate2.py", line 97, in _call_target
    raise InstantiationException(msg) from e
hydra.errors.InstantiationException: Error in call to target 'sheeprl.envs.dmc.DMCWrapper':
ValueError('too many values to unpack (expected 2)')

Since domain and task could contain multiple "_" separator we need to find another way to specify the DMC env.id.

cc @michele-milesi