Upgrade multisig

[eval-exec]

This PR want to add MultisigScript enum to ckb-sdk:

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum MultisigScript {
    /// Multisig Script deployed on Genesis Block
    /// https://explorer.nervos.org/script/0x5c5069eb0857efc65e1bca0c07df34c31663b3622fd3876c876320fc9634e2a8/type
    Legacy,

    /// Latest multisig script, Enhance multisig handling for optional since value
    /// https://github.com/nervosnetwork/ckb-system-scripts/pull/99
    /// https://explorer.nervos.org/script/0x36c971b8d41fbd94aabca77dc75e826729ac98447b46f91e00796155dddb0d29/data1
    V2,
}

And introduce a breaking change: constructing a MultisigConfig now requires specifying a MultisigScript variant.

before:

    let config = MultisigConfig::new_with(
                    sighash_addresses,
                    args.require_first_n,
                    args.threshold,
                )?

In this PR:

    let config = MultisigConfig::new_with(
                    MultisigScript::Legacy, // Or MultisigScript::V2
                    sighash_addresses,
                    args.require_first_n,
                    args.threshold,
                )?

[eval-exec]

Invite @doitian, @zhangsoledad, @driftluo , @quake to review.

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