Add SDK context

[tavurth]

Adds and injectable SDK context to the extension tree.

Use looks like:

import { useContext } from 'react'
import { SDKContext } from '../../context'

function MyComponent() {
  const sdk = useContext(SDKContext);
  ...
}

Or alternately:

import { useSDK } from '../../context'

function MyComponent() {
  const sdk = useSDK();
  ...
}

[sonarcloud[bot]]

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