Prepare packaging component crx for background images

[simonhong]

This is prerequisite for #10278
We're planning to deliver background images via component.

component will have image files and photo.json that describs the infos about included images

crx-packager PR: brave/brave-core-crx-packager#212
jenkins job issue: https://github.com/brave/devops/issues/4680

This is example photo.json.
Same as current NTP bg images list.

{
   "schemaVersion":1,
   "images":[
      {
         "name":"ntp-2020/2021-1",
         "source":"alex-plesovskich.avif",
         "author":"Alex Plesovskich",
         "link":"https://unsplash.com/@aples",
         "originalUrl":"Contributor sent the hi-res version through email",
         "license":"https://unsplash.com/photos/VPrTqd8B230"
      },
      {
         "name":"ntp-2020/2021-2",
         "source":"andre-benz.avif",
         "author":"Andre Benz",
         "link":"https://unsplash.com/@trapnation",
         "originalUrl":"Contributor sent the hi-res version through email",
         "license":"https://unsplash.com/photos/axQXVkrUASg"
      },
      {
         "name":"ntp-2020/2021-3",
         "source":"corwin-prescott_olympic.avif",
         "author":"Corwin Prescott",
         "link":"https://community.brave.com/",
         "originalUrl":"Contributor sent the hi-res version through email",
         "license":"used with permission"
      },
      {
         "name":"ntp-2020/2021-4",
         "source":"dylan-malval_alps.avif",
         "author":"Dylan Malval",
         "link":"https://www.instagram.com/vass_captures/",
         "originalUrl":"Contributor sent the hi-res version through email",
         "license":"used with permission"
      },
      {
         "name":"ntp-2020/2021-5",
         "source":"sora-sagano.avif",
         "author":"Sora Sogano",
         "link":"https://unsplash.com/@sorasagano",
         "originalUrl":"Contributor sent the hi-res version through email",
         "license":"https://unsplash.com/photos/UtJcj7_2zRs"
      },
      {
         "name":"ntp-2020/2021-6",
         "source":"spencer-moore_lake.avif",
         "author":"Spencer M. Moore",
         "link":"https://www.smoorevisuals.com/landscapes",
         "originalUrl":"Contributor sent the hi-res version through email",
         "license":"used with permission"
      },
      {
         "name":"ntp-2020/2021-7",
         "source":"su-san-lee.avif",
         "author":"Su San Lee",
         "link":"https://unsplash.com/@blackodc",
         "originalUrl":"Contributor sent the hi-res version through email",
         "license":"https://unsplash.com/photos/E_eWwM29wfU"
      },
      {
         "name":"ntp-2020/2021-8",
         "source":"zane-lee.avif",
         "author":"Zane Lee",
         "link":"https://unsplash.com/@zane404",
         "originalUrl":"Contributor sent the hi-res version through email",
         "license":"https://unsplash.com/photos/ZiDa9i7dY1E"
      }
   ]
}