Handle eth_signTypedData RPC call

[chabroA]

Handle eth_signTypedData RPC call

cf. https://ledgerhq.atlassian.net/browse/LIVE-3319

Blocked by (will be able to merge this PR when these blocking ones are merged / deployed):

• https://github.com/LedgerHQ/live-app-sdk/pull/149
• https://github.com/LedgerHQ/ledger-live/pull/892

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Name	Status	Preview	Updated
eth-dapp-browser	✅ Ready (Inspect)	Visit Preview	Aug 11, 2022 at 11:50AM (UTC)

[chabroA]

TODO: update sdk signMessage usage (signature of function has changed since PR date)