Add error boundaries

[lubej]

Description

• adds ErrorBoundary component, for catching ContextProvider errors;
• adds RouterErrorBoundary component for catching route and its children errors;

Resources

[lukaw3d]

I'm not sure how to check if this works.

[lubej]

I'm not sure how to check if this works.

To check ErrorBoundary, throw an error in one of the ContextProviders(Needs to be uncaught of course).
To check RouterErrorBoundary throw an error in one of the components(ConnectedAccount for example)