perf: collection/gallery explore page images

[hassnian]

PR Type

• [ ] Bugfix
• [ ] Feature
• [x] Refactoring

Context

First pr of more to come to close the main issue, this pr only focuses on the explore pages mainly

• lazy loading of images
• use cfi size variants to load smaller images where possible

Collection Explore

• lazy load images: eagerly load first 3 rows of each fetch remaining are lazy loaded
  • first page load (image resources) - mobile: 2.5mb (this pr) vs 19.8mb (prod) - desktop: 3mb (this pr) vs 19.8mb (prod)
• use metadata from collection meta , saves an extra call, most collections didn't need that (ahp 87/94 collections),
• use cfi size variants in collection images
  • banner: about the same for me , but should fetch smaller images depending on the user's display
  • image: average of 8-10x smaller images
• profile image: use cfi size variants
• remove: pwa.client.ts

Items Explore

• lazy load images: eagerly load first 2 rows of each fetch remaining are lazy loaded

• [x] Ref #10416

Needs QA check

• @kodadot/qa-guild please review

Did your issue had any of the "$" label on it?

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Screenshot 📸

• [ ] My fix has changed something on UI;