SDK: Add support for building & deserializing IBC NFT Transfers

[jurevans]

The @heliaxdev/namada-sdk SDK should provide support for building IBC NFT transfers

NOTES

• NFT Metadata https://github.com/anoma/namada/blob/f722c1c9ffc2691af2ee667d839f5d448779bb27/crates/ibc/src/nft.rs#L97-L106
• IBC Msg types: https://github.com/anoma/namada/blob/f722c1c9ffc2691af2ee667d839f5d448779bb27/crates/ibc/src/msg.rs#L22-L28
• We will need to be able to construct IbcMsgNftTransfer IBC message:
  • https://github.com/anoma/namada/blob/f722c1c9ffc2691af2ee667d839f5d448779bb27/crates/ibc/src/msg.rs#L84-L89

NFT Packet Data for IBC:

pub struct PacketData {
    #[cfg_attr(feature = "serde", serde(with = "serializers"))]
    #[cfg_attr(feature = "schema", schemars(with = "String"))]
    pub class_id: PrefixedClassId,
    pub class_uri: Option<ClassUri>,
    pub class_data: Option<ClassData>,
    pub token_ids: TokenIds,
    // Need `Option` to decode `null` value
    pub token_uris: Option<Vec<TokenUri>>,
    // Need `Option` to decode `null` value
    pub token_data: Option<Vec<TokenData>>,
    pub sender: Signer,
    pub receiver: Signer,
    pub memo: Option<Memo>,
}