batch signMessage in keystore to optimize performance

[homura]

Motivation

The transfer all feature in nexus-demo spent about 1 min to sign a transaction with 30 different locks, we need to support signing message in batch

nexus/packages/types/src/services/KeystoreService.ts

Lines 79 to 92 in e2c5155

	export interface SignMessagePayload {
	/**
	* message be to signed
	*/
	message: BytesLike;
	/**
	* derivation path of the private key, will be used to sign the message
	*/
	path: HardenedPath | NonHardenedPath;
	/**
	* password to decrypt the keystore
	*/
	password: PasswordProvider;
	}

[homura]

#225 has resolved this issue