[isort] Improve import formatting configuration
🚀 Feature
Although #4242 have recently introduced isort to check and apply import formatting, I find the import order somewhat confusing, so I'd like to suggest to add the following two options to isort config pyproject.toml.
force_sort_within_sections = 'True'
# before
import torch
from pytorch_lightning import Callback
from torch.nn import functional as F

# after
from pytorch_lightning import Callback
import torch
from torch.nn import functional as F
order_by_type = 'False'
# before
from torch import Tensor, nn

# after
from torch import nn, Tensor
Since we have applied isort to only a few files as listed in #4805, I believe we can still modify the config. Let me know your thoughts on this. (This is the same issue as PyTorchLightning/lightning-bolts#422.)