Preset calls with metadata

[arrudagates]

Saturn allows for custom metadata that can be used for the call being made to carry it's context and intentions with it to be interpreted and used in custom renders that replace the traditional call data json/yaml renders.

We should have preset calls that come with metadata already in it and we should have a metadata matcher to interpret metadata from retrieved multisig calls.

Things like function:metadata:

batchMemberManagement:"Sat:BMM"
setParameters:"Sat:SP"
callXcm:"Sat:CX"
balanceTransfer:"Sat:BT"
xcmBalanceTransfer:"Sat:XBT"

And then the matcher could take the entire multisig call data and transform it into an enum like so:

enum {
batchMemberManagement { members: {adding: bool, who: account, amount: number}[] },
setParameters { metadata: string, frozenTokens: bool, minimumSupport: perbill, requiredApproval: perbill },
callXcm { destination: string, call: string, weight: number },
balanceTransfer { to: account, amount: number },
xcmBalanceTransfer { asset: { chain: string, token: string }, to: account, amount: number }
}

This basically allows for extremely easy Saturn integration with the ability to create custom rendering for these predefined calls, and also gives developers the base to implement their own predefined functions with custom metadata and matchers.