Account key structs

[bluesign]

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Issue To Be Solved

We have 2 different key structs in codebase and they are pretty much same (except order of SeqNumber and Weight)

type sdk.AccountKey struct {
	Index          int
	PublicKey      crypto.PublicKey
	SigAlgo        crypto.SignatureAlgorithm
	HashAlgo       crypto.HashAlgorithm
	Weight         int
	SequenceNumber uint64
	Revoked        bool
}

type flow-go.AccountPublicKey struct {
	Index     int
	PublicKey crypto.PublicKey
	SignAlgo  crypto.SigningAlgorithm
	HashAlgo  hash.HashingAlgorithm
	SeqNumber uint64
	Weight    int
	Revoked   bool
}

I think it would be nice to get rid of one or at least make structures same.