Feature/si 1594 ledger hid connection via low speed internet

[manneredboor]

Description

There is an issue if the ledger packages loading takes too long (~ >5 sec): a user will see a connection error immediately after packages were loaded. That happens because of browser protection mechanism called User Activation.

Suggestion: Measure the time it took to download the Ledger packages. If it took >3s, show an additional "Connect" button in the Ledger modal instead of trying to connect right away.

Testing notes

1. Enable "Slow 4g" throttling option
2. Click "Ledger" connect button
3. Huge ledger packages are starting to load, it takes >5 seconds
4. Ledger packages are finished loading. There was an error before on this stage. Now it should show "Connect" button, which when being clicked confirms user intention for the browser.

Demo

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Latest commit: 70ab6f3

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