feat(website): CAN-479 - Refactor custom providers

[nicosampler]

This PR closes CAN-479. closes https://linear.app/usecannon/issue/CAN-473/ui-is-not-using-the-configured-providers-from-the-settings-page

I've converted the useProviders hook to a Provider which exposes useProviders.

Hopefully, this PR fixes the case of using custom providers not supported by viem.

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[dbeal-eth]

@nicosampler please check if this PR replaces or should be in tandem or what with this PR https://github.com/usecannon/cannon/pull/1330

[nicosampler]

@nicosampler please check if this PR replaces or should be in tandem or what with this PR #1330

@dbeal-eth Ideally it should replace #1300, but I couldn't find the time yet if it works properly. Noah sent me a link to try to deploy to Snax.