Store initiator origin info for DAPP requests

[yrliou]

We need to store initiator's origin for dapp requests that would prompt UI for user to confirm.

See BraveWalletJSHandler::SendAsync, BraveWalletJSHandler::Send, BraveWalletJSHandler::Request for entry points.
See BraveWalletProviderImpl::CommonRequestOrSendAsync for how backend start to process different methods.

Besides sendEthTransaction requests that would be get from pending transactions. UI get those pending requests in /~https://github.com/brave/brave-core/blob/master/components/brave_wallet_ui/panel/async/wallet_panel_async_handler.ts#L171-L194. We need to provide initiator's origin for all these DAPP requests to UI.

/~https://github.com/bbondy/eth-manual-tests and https://metamask.github.io/test-dapp/ might be useful for testing.

For QA:

1. Go to https://metamask.github.io/test-dapp/
2. Click connect and setup with one of wallet accounts
3. On this site scroll to "Ethereum Chain Interactions", click "Add xDAI Chain" button. This wallet bubble appears
   
   Close bubble by clicking outside of it.
4. Open some other tab and click Wallet button
5. Same bubble appears. It should have metamask url and icon on top of it:
   Bad:
   
   Good:
   

[yrliou]

eTLD+1 is also needed to be stored, see brave/brave-core#12701.

[diracdeltas]

does this also need to be done for iOS/android? i noticed brave/brave-ios#5218

[srirambv]

Brave	1.39.96 Chromium: 101.0.4951.54 (Official Build) beta (64-bit)
Revision	67da1aeb32cedd27634ca6634fb79cbd85d3f0ab-refs/branch-heads/4951@{#1126}
OS	☑️ Linux	☑️ Windows 11 Version Dev (Build 22616.1)	☑️ macOS Version 12.0.1 (Build 21C52)
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