Support EVM compatible chains

[SergeyZhukovsky]

No description provided.

[Uni-verse]

Verification PASSED on Samsung GS 21 running Android 12 using build version:

1.36.86, Chromium 98.0.4758.87

Verified Acceptance Criteria:

• User is able to add custom EVM compatible networks - 5efd665
• Buy/Swap action button options hidden when a custom network is selected - adb5c84
• Custom networks are displayed in dropdown after getting added in the settings
• User is able to remove custom networks in the settings
• User can edit custom networks in the settings
• User is able to set network as active in the settings
• User can edit visiable assets in the Portfolio tab for custom networks
• Tapping Send when viewing asset details opens the send screen and selects the currency token for the network selected by default

Network Dropdown	Buy/Swap hidden	Network menu item

[srirambv]

Verification passed on Samsung Tab A with Android 10 running 1.36.87 x64 beta build

• Verified steps from brave/brave-core#11822
• Verified a new setting item is shown under Menu -> Brave Wallet -> Networks
• Verified able to add a new custom network via wallet settings from wallet or via menu settings
• Verified added custom networks show up on portfolio
• Verified custom networks only has send transactions
• Verified transaction approval shows up for custom EVM networks
• Verified able to add multiple custom networks
• Verified added custom networks are retained between restarts
• Encountered #20967 & #20968
• Verified correct error message is shown for each field

New Networks Setting	Add network	Network Details	Add Network details	Added Custom networks

Custom Network on Portfolio	Select Custom Network	Send only	Transaction Approval	Transaction Details

Chain ID	Chain Name	Chain Currency	Chain Currency Symbol	Decimal	RPC	Block Explorer