Change logos processing for marketplace dApps

[maikReal]

What to do?

Product epic: https://www.notion.so/blockscout/Fix-dApp-logo-displaying-771dcba7dec94b929ea0aa2728402735?pvs=4

1. We need to add an auto-adding border radius for dApp logos. We can set border-radius to 8px, based on the following design

UPD [04.12]: The seconds point is not relevant
2. 1. For now we upload only one version of a dApp logo. It causes situations when one logo could look good on one theme, but weird on another one. My and @tgladilina idea is the following:
- For .png/.jpeg formats we can add white/dark border for logos
- For .svg format the algorithm is the following:
1. Checking the color of the logo on the border
2. If it's dark:
- On the dark theme: add white background
- On the light theme: do nothing
3. If it's light:
- On the dark theme: do nothing
- On the light theme: add dark background

[tgladilina]

Cases

[isstuev]

in fact, the task was to add 8px border radius to icons