constructors to create wasm contract call json payloads

[Reecepbcups]

Description

Moves verifyMembership and verifyNonMembership types into their respective constructor functions for cleaner (1q line) payload generation.

closes: #4044

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[crodriguezvega]

Thank you for picking up a bunch of the 08-wasm issues, @Reecepbcups. :) This one in particular will require some changes, since we received a recommendation by Ethan Frey to organise the payload types a bit differently. I will open an issue and post it here when it's ready.

[Reecepbcups]

np, sounds good

[damiannolan]

These structs will be replaced with two higher level structures for Sudo and Query contract calls with each containing a pointer to a struct to represent each action, note the omit_empty is required for json serialization. These structures play well with having the msg enums defined in the rust code for match expressions etc, naming tbc.

// encapsulates read-only contract calls
type QueryPayload struct {
  MsgStatus *StatusPayload `json:"msg_status,omitempty"`
  MsgVerifyMembership *VerifyMembershipPayload`json:"msg_verify_membership,omitempty"`
  // ..etc
}

// anything which writes to store
type SudoPayload struct {
  MsgInitialize *InitializePayload `json:"msg_initialize,omitempty"`
  MsgUpdateState *UpdateStatePayload `json:"msg_update_state,omitempty"`
  // ..etc
}

[crodriguezvega]

Hi @Reecepbcups, this PR implements the changes mentioned by @damiannolan above. Take a look and let us know if you would like to continue the work of your PR. If you're busy, no problem, we can take over :) Also, it might be better to use the branch of #4133 to implement the changes on top of it.

[Reecepbcups]

@crodriguezvega Hey sorry for the late reply here. I will be out of town the next 7 - 10ish days still so I will not be able to take this on.

I will get to more cleanup PRs once I get back if this has not been handled by then. (+ older issues I find)