Deeplinks

[alx-khramov]

This PR adds a support for deeplinks and adds deeplinks to wallets adapters for wallets, supporting deeplinks.

Resolves SI-955, SI-963, SI-986

How it works in general:

A user takes a mobile device, opens a regular mobile browser like Safari, opens dApp in it and clicks on a wallet connection button.

1. If a wallet is detected (web3 provider like window.ethereum is found), then it will be connected and that's it.
2. A wallet wasn't detected, but a deeplink for the wallet is defined in the Wallet Adapter. Then a new browser's tab is opened using the deeplink as an address. See the section below about "Detection of a wallet app" for some details.
3. Otherwise, if a wallet is not detected and there is no deeplink, redirect the user to the wallet's download page.

Detection of a wallet app on a user's device

We are not able to detect if some mobile app, which wasn't developed by us, is installed on a user's device. This is right, at least for security reasons.
Some wallets provide a web page like https://metamask.app.link, which can detect if a wallet app is installed and redirect a user to a deeplink in this case. And redirect to the download page otherwise. If a wallet provides such a page, we use it.
But not all wallets do this. For example, imToken just provides a raw deeplink without ability to detect if a wallet is installed. So, if a user opens a dApp on a mobile device in a mobile browser, clicks imToken to connect, but it is not installed on the device, then the user will get an empty white page in the browser. And it seems, there is nothing can be done with it.

Wallets affected

Deeplinks were added for: MetaMask, BitKeep, Coin98, imToken, OKX, Trust wallets.

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Latest commit: 2e9913d

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[DiRaiks]

lgtm