Add a switch to disable Brave Wallet

[bbondy]

Add a switch in preferences alongside the IPFS and WebTorrent one to disable Brave Wallet functionality. This will prevent it from being loaded and even installed if one navigates to brave://wallet.

If you disable it should not show the option in the hamburger menu for the wallet. It should also fail to load if you go direct to brave://wallet, it should say blocked.

There's a distinction that's important to understand between enabled and installed.

By default Brave rewards is enabled (and can be installed implicitly by selecting the menu item or by navigating to brave://wallet). If you do a new profile and go directly to settings, you'll see it enabled, because the functionality is available.
You can disable right away on a new profile, in which case the hamburger menu won't be available and requests will be blocked.

[kjozwiak]

@bbondy @ryanml is this the same as the switch that's currently available in the 0.69.x release via brave://settings? Example:

When enabling/disabling the above, it will remove Crypto Wallets from the hamburger menu but won't remove the header button via brave://settings.

If this is different, can we get a test plan? Thanks!

[PaulRBerg]

A suggestion for MetaMask users: automatically set "Crypto Wallet" to false. I was debugging my dapp and I thought there was a problem with my code but there were just too many web3 providers.

[kjozwiak]

@PaulRBerg we're discussing how to handle the above better when MM is also installed. CCing @tomlowenthal.

[LaurenWags]

QA/Blocked pending response to #5673 (comment)

[kjozwiak]

Talked to @bbondy re: the above. This already landed in 0.69.x as per #5673 (comment). It was also QA'd extensively in other ETH related issues in 0.69.x.