store active extension + wallet in localstorage and initialize lazy

[niklasp]

This PR closes #15 by storing the selected extension + walletAddress in localstorage when the extension is enabled / the account is selected. The selections are then restored when the dApp is initialized. For backwards compatibility the setActiveAccount function is overridden to atomatically save to local storage.

The other addition is the userWantsConnection const also discussed in #15 which enables a better UX by not popping up extension windows on page visit. For backwards compatibility when connectOnInit is set to true in the provider, the popups remain. When it is set to false and the user already connected an extension + account, it will also connect the wallet on page reload - until the user disconnects.

See also this video with a demo of a first visitor to the dapp

https://github.com/scio-labs/use-inkathon/assets/1685139/038eb1d5-48a6-406c-8d73-de50500bb5eb

and check it out live on a boilerplate including the changes here (with connectOnInit={false} behavior): https://inkathon-frontend-git-localstorage-niklasps-projects.vercel.app/

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[niklasp]

@wottpal comments?

[langdon0003]

@wottpal Could you please take a look and give feedback on this PR, I currently use use-inkathon on my daap and I thing this feature is a must. thank you

[wottpal]

I will revisit this one shortly, sorry for the radio silence :)

[niklasp]

@wottpal atm i have to use my cloned version for dapps as this is missing. any chance for merge? I can also change things.

[niklasp]

pong