Uploaded asset names with unsupported characters are not checked against asset spec, and cannot be downloaded

[nmichlo]

After diving into the code, modelkit lists the following regex for asset names:

GENERIC_ASSET_NAME_RE = (
    r"(([A-Z]:\\)|/)?[a-zA-Z0-9]([a-zA-Z0-9\-\_\.\/\\]*[a-zA-Z0-9])?"
)

However:

1. uploaded assets and sub-files are not checked against this.
2. This does not include all valid URI and file name characters.

I uploaded a file that was named something similar to file__id==version, and because == is invalid according to the regex. The file could be uploaded, but when specified in a model config for the asset it freezes when trying to resolve the asset and no error is throw. The asset also cannot be downloaded via code.