Infura interactions should be behind fastly proxy cache

[ryanml]

Server side work completed by @bkero here: https://github.com/brave/devops/pull/1936
Caching should be enabled for each supported network.

Test Plan:
Testing this involves a general regression test of crypto wallet functionality. This includes:

• Sending/Receiving assets
• Adding ERC-20 tokens
• Connecting to and interacting with dApps
• Ensuring that balances/conversions are accurate and up to date.

[kjozwiak]

@ryanml just curious if there's a reason this is in the Dupe / Invalid / Not actionable milestone?

[kjozwiak]

Verification PASSED on macOS 10.14.6 x64 using https://github.com/brave/ethereum-remote-client/releases/tag/v0.1.18 with the following build:

Brave	0.70.121 Chromium: 78.0.3904.70 (Official Build) (64-bit)
Revision	edb9c9f3de0247fd912a77b7f6cae7447f6d3ad5-refs/branch-heads/3904@{#800}
OS	macOS Version 10.14.6 (Build 18G95)

• Restored a MM wallet and sent both ETH/BAT into the wallet without issues
• Restored a Crypto wallet and sent both ETH/BAT into the wallet without issues
• ensured that the conversions where correct when sending/receiving ETH/ERC-20 tokens
• Purchased meme using ETH via https://memefactory.io/ (example below)
  • https://etherscan.io/tx/0x92f36e275c503c5e695e9dba3822def42cd647b088abe39f05799b9ef570ede2
• Also went through the manual passes via Manual test run on OS X for Ethereum Remote Client 1.0.12 #6679 which covers a lot general functionality cases

Examples:

[srirambv]

Verification passed on

Brave	0.70.121 Chromium: 78.0.3904.70 (Official Build) (64-bit)
Revision	edb9c9f3de0247fd912a77b7f6cae7447f6d3ad5-refs/branch-heads/3904@{#800}
OS	Linux

• Verified using remote component 0.1.18
• Verified ETH/BAT is sent into a restored MM wallet
• Verified ETH/BAT is sent into a restored Crypto Wallet
• Verified sending conversion for ETH/ERC-20 tokens is correct
• Verified buying via CW works on https://memefactory.io/ with transaction
  

[kjozwiak]

Verification PASSED on Win 10 x64 using https://github.com/brave/ethereum-remote-client/releases/tag/v0.1.18 with the following build:

Brave	0.70.121 Chromium: 78.0.3904.70 (Official Build) (64-bit)
Revision	edb9c9f3de0247fd912a77b7f6cae7447f6d3ad5-refs/branch-heads/3904@{#800}
OS	Windows 10 OS Version 1809 (Build 17763.805)

• Restored a MM wallet and sent both ETH/BAT into the wallet without issues
• Restored a Crypto wallet and sent both ETH/BAT into the wallet without issues
• ensured that the conversions where correct when sending/receiving ETH/ERC-20 tokens
• Purchased meme using ETH via https://memefactory.io/ (example below)
  • https://etherscan.io/tx/0x4bb9700b22de9fcd76295dd90adbc65f21195d0c33174d39729d741dd2ccf4ba
• Also went through the manual passes via Manual test run on OS X for Ethereum Remote Client 1.0.12 #6679 which covers a lot general functionality cases

Examples: