Preview depending on Content-Type

[NecatiMeral]

Hi,

we're uploading objects with arbitary guids as object names (without file extensions).
Instead we upload files with the correct Content-Type set.

How about enabling image preview depending on the set Content-Type if there isn't a extension?
Prior separating the console code from minio/minio to minio/console this seemed to be a thing (minio/minio#9239).

I wanted to discuss this topic first before opening a contribution.

[prakashsvmx]

Tracked in #2930 and issue #2919