[FEATURE] Upload screenshots/icons

[vogloblinsky]

Using this API : https://developer.huawei.com/consumer/en/doc/development/AppGallery-connect-References/agcapi-app-file-info-0000001111685202

I will check if i have time to do a PR

[shr3jn]

Ok I will see if this can be planned.

[shr3jn]

When uploading image through the upload URL, the following error response is observed:
Tried with JPG/PNG and size < 2MB as said on docs.
{
"result": {
"CException": {
"errorCode": 77720022,
"errorDesc": "image type can't match"
},
"resultCode": "77720022"
}
}