Compose cannot work with both Decollated and MultiSampleTrait transforms

Describe the bug If Compose is used with the following types of transforms, the third transform will not get the expected input:

Decollated, which splits the input. This transform looks like:
```
Callable[dict[str, Tensor], list[dict[str, Tensor]]]
```
MultiSampleTrait, which further splits the input. Note that the accumulated effect is now:
```
Callable[dict[str, Tensor], list[list[dict[str, Tensor]]]]
```
MapTransform, which expect a dict[str, Tensor] from the caller (Compose in this case), will error.

To Reproduce Code snippet:

import torch
from monai.transforms import Compose, RandSpatialCropSamplesd, Resized, Decollated

transform = Compose(
    [
        Decollated(keys=["img"]),
        RandSpatialCropSamplesd(
            keys=["img"],
            roi_size=(1, 192, 192),
            num_samples=2,
            max_roi_size=(1, 320, 320),
            random_center=True,
            random_size=True,
        ),
        Resized(keys=["img"], spatial_size=(1, 224, 224)),
    ]
)

img = {"img": torch.rand(3, 1, 1, 512, 512)}

transform(img)

This will error:

  File ".../python3.11/site-packages/monai/transforms/spatial/dictionary.py", line 846, in __call__
    d = dict(data)
        ^^^^^^^^^^
ValueError: dictionary update sequence element #0 has length 1; 2 is required

Expected behavior Right now I can get around this by inserting a custom transform that flattens the nested list. But Compose should handle this just like it handles usual MultiSampleTrait transforms.

Environment

================================
Printing MONAI config...
================================
MONAI version: 1.4.0
Numpy version: 1.26.4
Pytorch version: 2.5.0+cu124
MONAI flags: HAS_EXT = False, USE_COMPILED = False, USE_META_DICT = False
MONAI rev id: 46a5272196a6c2590ca2589029eed8e4d56ff008
MONAI __file__: /hpc/mydata/<username>/anaconda/2022.05/x86_64/envs/viscy/lib/python3.11/site-packages/monai/__init__.py

Optional dependencies:
Pytorch Ignite version: NOT INSTALLED or UNKNOWN VERSION.
ITK version: NOT INSTALLED or UNKNOWN VERSION.
Nibabel version: NOT INSTALLED or UNKNOWN VERSION.
scikit-image version: 0.24.0
scipy version: 1.14.0
Pillow version: 10.4.0
Tensorboard version: 2.17.1
gdown version: NOT INSTALLED or UNKNOWN VERSION.
TorchVision version: 0.20.0+cu124
tqdm version: 4.66.5
lmdb version: NOT INSTALLED or UNKNOWN VERSION.
psutil version: 6.0.0
pandas version: 2.2.2
einops version: NOT INSTALLED or UNKNOWN VERSION.
transformers version: NOT INSTALLED or UNKNOWN VERSION.
mlflow version: NOT INSTALLED or UNKNOWN VERSION.
pynrrd version: NOT INSTALLED or UNKNOWN VERSION.
clearml version: NOT INSTALLED or UNKNOWN VERSION.

For details about installing the optional dependencies, please visit:
    https://docs.monai.io/en/latest/installation.html#installing-the-recommended-dependencies

================================
Printing system config...
================================
System: Linux
Linux version: Rocky Linux 8.10 (Green Obsidian)
Platform: Linux-4.18.0-553.16.1.el8_10.x86_64-x86_64-with-glibc2.28
Processor: x86_64
Machine: x86_64
Python version: 3.11.9
Process name: python
Command: ['python', '-c', 'import monai; monai.config.print_debug_info()']
Open files: [popenfile(path='/home/<username>/.vscode-server/data/logs/20241031T101853/remoteagent.log', fd=19, position=5336, mode='a', flags=33793), popenfile(path='/home/<username>/.vscode-server/data/logs/20241031T101853/ptyhost.log', fd=20, position=4686, mode='a', flags=33793)]
Num physical CPUs: 16
Num logical CPUs: 16
Num usable CPUs: 16
CPU usage (%): [8.5, 8.5, 3.5, 8.1, 3.9, 3.9, 3.2, 4.6, 5.0, 18.6, 23.9, 3.5, 3.5, 3.6, 4.3, 4.6]
CPU freq. (MHz): 2935
Load avg. in last 1, 5, 15 mins (%): [0.6, 0.5, 1.4]
Disk usage (%): 93.3
Avg. sensor temp. (Celsius): UNKNOWN for given OS
Total physical memory (GB): 503.8
Available memory (GB): 440.0
Used memory (GB): 27.3

================================
Printing GPU config...
================================
Num GPUs: 1
Has CUDA: True
CUDA version: 12.4
cuDNN enabled: True
NVIDIA_TF32_OVERRIDE: None
TORCH_ALLOW_TF32_CUBLAS_OVERRIDE: None
cuDNN version: 90100
Current device: 0
Library compiled for CUDA architectures: ['sm_50', 'sm_60', 'sm_70', 'sm_75', 'sm_80', 'sm_86', 'sm_90']
GPU 0 Name: NVIDIA A40
GPU 0 Is integrated: False
GPU 0 Is multi GPU board: False
GPU 0 Multi processor count: 84
GPU 0 Total memory (GB): 44.7
GPU 0 CUDA capability (maj.min): 8.6

Project-MONAI / MONAI

Compose cannot work with both Decollated and MultiSampleTrait transforms #8186