Extract WalletConnectorFrame, deprecate AeSdkAepp

[davidyuk]

This PR is supported by the Æternity Crypto Foundation

closes #1838, based on #1865

The idea is that different ways to connect aepp vs wallet can't have the same interface, so I think they should have their own interfaces with the ability to connect to an aepp-wide SDK instance. In the example, I'm connecting to a wallet using frame-based rpc, and a Ledger Wallet (doesn't need a connector class because it is quite simple) to the same SDK instance.

Using this approach, we can replace

if (isDev) {
  aeSdk = new AeSdk({ accounts: [<dev accounts>] })
} else {
  aeSdk = new AeSdkAepp(...)
}

with a single sdk instance and a separate logic that connects this instance to a specific wallet.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 45 lines in your changes missing coverage. Please review.

Project coverage is 90.17%. Comparing base (908930d) to head (33a081a).
Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
...p-wallet-communication/WalletConnectorFrameBase.ts	20.00%	28 Missing ⚠️
...llet-communication/WalletConnectorFrameWithNode.ts	30.76%	9 Missing ⚠️
.../aepp-wallet-communication/WalletConnectorFrame.ts	20.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1866      +/-   ##
===========================================
- Coverage    91.29%   90.17%   -1.12%     
===========================================
  Files          106      109       +3     
  Lines         3502     3562      +60     
  Branches       733      735       +2     
===========================================
+ Hits          3197     3212      +15     
- Misses         289      334      +45     
  Partials        16       16              

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