AES-KW: Missing Support in imgtool (?)

[ozersa]

It seems AES-KW is not support in imgtool, I have not seen AES-KW implementation in the imgtool.

Just a Note:

• AES-KW tag exist in imgtool: https://github.com/mcu-tools/mcuboot/blob/main/scripts/imgtool/image.py#L83
• The mcuboot repo includes sample AES‑KW key files, enc-aes128kw.b64,
  enc-aes256kw.b64
• The docs describe AES‑KW as a supported wrap method, https://docs.mcuboot.com/encrypted_images.html

Can maintainers confirm if AES‑KW (TLV 0x31) is supported by imgtool? The tag exists, but I can’t find any implementation.