Support resolution of unstoppable domains with IPFS records via Ethereum

[yrliou]

Description

This issue is to track adding support of resolution of unstoppable domains with IPFS records via Ethereum network directly.
We'll be calling ProxyReader.GetMany from Unstoppable Domains to retrieve IPFS records and redirect to the target IPFS URI.
After that, IPFS support in Brave will take over the rest.

[stephendonner]

Verified PASSED using the testplan from brave/brave-core#8456 on build

Brave	1.25.22 Chromium: 90.0.4430.72 (Official Build) nightly (x86_64)
Revision	b6172ef8d07ef486489a4b11b66b2eaeed50d132-refs/branch-heads/4430@{#1233}
OS	macOS Version 11.2.3 (Build 20D91)

Steps:

1. Went to settings, opened drop-down of ENS resolve method settings, and verified it did NOT have Ethereum.
2. Changed the resolve method of Unstoppable Domains to Ethereum
3. Went to brave://settings/ipfs, set the Method to resolve to Gateway
4. Visited brave.crypto and confirmed the URL https://bafybeid6rntsjiydicxj5cnmnqonbvwv35lrjgd6dngskptra3oa2otxxm.ipfs.dweb.link/ was loaded via IPFS

example	example	example

[srirambv]

Verification passed on

Brave	1.25.53 Chromium: 90.0.4430.93 (Official Build) beta (64-bit)
Revision	4df112c29cfe9a2c69b14195c0275faed4e997a7-refs/branch-heads/4430@{#1348}
OS	Windows 10 OS Version 2009 (Build 19042.867)

• Verified Ethereum is an option under Unstoppable Domain resolution
  
• Verified ENS doesn't have an entry for Ethereum in dropdown
  
• Verified setting UD to resolve via Ethereum and setting IPFS to gateway loads the page using IPFS Public gateway(dweb.link)

---

Verification passed on

Brave	1.25.53 Chromium: 90.0.4430.93 (Official Build) beta (64-bit)
Revision	4df112c29cfe9a2c69b14195c0275faed4e997a7-refs/branch-heads/4430@{#1348}
OS	Linux

• Verified Ethereum is an option under Unstoppable Domain resolution
  

• Verified ENS doesn't have an entry for Ethereum in dropdown
  

• Verified setting UD to resolve via Ethereum and setting IPFS to gateway loads the page using IPFS Public gateway(dweb.link)