Add state store mocks

[tinder-garricnahapetian]

No description provided.

[tinder-cfuller]

Based on offline discussions, the decision is to add mocks similar to what this PR was initially introducing, but without the bind methods, as the bind methods will be removed from the protocols on another PR.

For reference:

StateStoreMock.swift:

//
//  Copyright © 2024 Tinder (Match Group, LLC)
//

import Nodes
import SwiftUI

public final class StateStoreMock<State: Equatable>: StateStore, ObservableStateStore {

    public var state: State {
        didSet { stateSetCallCount += 1 }
    }

    public private(set) var stateSetCallCount: Int = 0

    public init(state: State) {
        self.state = state
    }
}

ViewStateStoreMock.swift:

//
//  Copyright © 2024 Tinder (Match Group, LLC)
//

import Nodes
import SwiftUI

public final class ViewStateStoreMock<ViewState: Equatable>: ViewStateStore, ObservableViewStateStore {

    public var viewState: ViewState {
        didSet { viewStateSetCallCount += 1 }
    }

    public private(set) var viewStateSetCallCount: Int = 0

    public init(viewState: ViewState) {
        self.viewState = viewState
    }
}