deprecate `meta_dict` usage in `monai.auto3dseg`

[wyli]

for example, this should be deprecated in favor of metatensor reprentations

MONAI/monai/auto3dseg/analyzer.py

Line 192 in 84e271e

self, image_key: str, stats_name: str = "image_stats", meta_key_postfix: Optional[str] = "meta_dict"

MONAI/monai/auto3dseg/analyzer.py

Line 764 in 84e271e

def __init__(self, key: str, stats_name: str, meta_key_postfix: Optional[str] = "meta_dict") -> None:

[mingxin-zheng]

@wyli Thanks for bring up the issue.

What's your opinion to deprecate the meta_key_postfix? I think we can either

• Remove the meta_key_postfix in the next release
• Add deprecation message and keep it for a few version