[relayer] use Vec<u8> instead of Vec<Felt>

[rnbguy]

In cairo code, we use Array<u8> for StateProof and Acknowledgment

ibc-starknet/cairo-contracts/packages/core/src/commitment/types.cairo

Lines 103 to 105 in c13b888

	pub struct StateProof {
	pub proof: Array<u8>,
	}

ibc-starknet/cairo-contracts/packages/core/src/channel/types.cairo

Lines 320 to 322 in c13b888

	pub struct Acknowledgement {
	pub ack: Array<u8>,
	}

But because of #178, in the rust relayer code, we use Vec<Felt> for StateProof and Acknowledgment.

ibc-starknet/relayer/crates/starknet-chain-components/src/types/messages/ibc/packet.rs

Lines 77 to 81 in c13b888

	pub struct StateProof {
	// TODO(rano): Array<u8> in Cairo
	// Currently, Vec<u8> is serialized for ByteArray
	pub proof: Vec<Felt>,
	}

ibc-starknet/relayer/crates/starknet-chain-components/src/types/messages/ibc/packet.rs

Lines 143 to 146 in c13b888

	pub struct Acknowledgement {
	// TODO(rano): Array<u8> in Cairo
	// Currently, Vec<u8> is serialized for ByteArray
	pub ack: Vec<Felt>,