Add extension sig support

[nuel77]

Describe your changes

• add support for verifying sr25519 signatures from pokadot.js extension called using signRaw. Enabling orders places via wallets (funding accounts) to be verified directly.
• RegisterMainAccount extrinsic can be deprecated once support added fully to offchain worker and orderbook, as deposit extrinsic can directly register the funding account for new users, enabling users to start trading with one click.

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