Support SIWE using selected account (#61)

* Sign in using selected address

* Use optional namespace

* Merge namespaces and use combined namespace

* Add todo for lodash merge

* Use walletConnect util buildApprovedNamespaces while approving sessions

* Lint fixes

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Co-authored-by: Adw8 <adwait@deepstacksoft.com>
Co-authored-by: Nabarun <nabarun@deepstacksoft.com>

__tests__/App.test.tsx

@@ -7,7 +7,7 @@ import React from 'react';
 import App from '../src/App';
 
 // Note: import explicitly to use the types shipped with jest.
-import {it} from '@jest/globals';
+import { it } from '@jest/globals';
 
 // Note: test renderer must be required after react-native.
 import renderer from 'react-test-renderer';