Feature/validator api client endpoints (#1024)

* Moved mixnode status route to node status api module

* Introduced validator-api endpoint for estimating mixnode's reward

* Stake saturation endpoint

* kebab-cased coconut routes

* Created separate crate for validator API models

* Additional routes in validator API client

* Introduced support for new queries in the wallet

* Typescript type derivation

* Fixed up date in license notice

validator-api/validator-api-requests/src/lib.rs

@@ -0,0 +1,4 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub mod models;

validator-api/validator-api-requests/src/models.rs

@@ -0,0 +1,53 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Copy, Debug, Serialize, Deserialize, PartialEq, Eq)]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+#[serde(rename_all = "snake_case")]
+pub enum MixnodeStatus {
+    Active,   // in both the active set and the rewarded set
+    Standby,  // only in the rewarded set
+    Inactive, // in neither the rewarded set nor the active set, but is bonded
+    NotFound, // doesn't even exist in the bonded set
+}
+
+impl MixnodeStatus {
+    pub fn is_active(&self) -> bool {
+        *self == MixnodeStatus::Active
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+pub struct CoreNodeStatusResponse {
+    pub identity: String,
+    pub count: i32,
+}
+
+#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+pub struct MixnodeStatusResponse {
+    pub status: MixnodeStatus,
+}
+
+#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+pub struct RewardEstimationResponse {
+    pub estimated_total_node_reward: u128,
+    pub estimated_operator_reward: u128,
+    pub estimated_delegators_reward: u128,
+
+    pub current_epoch_start: i64,
+    pub current_epoch_end: i64,
+    pub current_epoch_uptime: u8,
+    pub as_at: i64,
+}
+
+#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+pub struct StakeSaturationResponse {
+    pub saturation: f32,
+    pub as_at: i64,
+}