Add WalletConnect support

[jribbink]

Closes #2072 #2137 #2138

This implementation still has the following issues:

• Authentication flickering
• Flow Wallet Connector does not support WC (see 4a8d094)
• Rare race condition when flow wallet is slow to inject where 2 wallets can sometimes appear. Addressing this likely requires some clever refactoring and should be done in a follow up PR as is a lower prio than basic functionality/alpha.

The current servicePlugin extensibility system is bound to requests instead of sessions, making persistence and robust lifecycle management difficult to implement. I converted this to use a UniversalProvider instead so that both FCL-WC & the Eth WC provider can rely on the same shared interface.

[changeset-bot]

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Latest commit: c8cb07c

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