Rpc: Add getStakeActivation endpoint (#10902)

* Add getStakeActivation endpoint

* Add docs

* Update docs/src/apps/jsonrpc-api.md

Co-authored-by: Michael Vines <mvines@gmail.com>

* Rework return type

* Update docs

* Rebase

Co-authored-by: Michael Vines <mvines@gmail.com>

client/src/rpc_config.rs

@@ -37,7 +37,7 @@ pub struct RpcLargestAccountsConfig {
 
 #[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
-pub struct RpcInflationConfig {
+pub struct RpcStakeConfig {
     pub epoch: Option<Epoch>,
     #[serde(flatten)]
     pub commitment: Option<CommitmentConfig>,

client/src/rpc_response.rs

@@ -202,3 +202,20 @@ pub struct RpcSupply {
     pub non_circulating: u64,
     pub non_circulating_accounts: Vec<String>,
 }
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "camelCase")]
+pub enum StakeActivationState {
+    Activating,
+    Active,
+    Deactivating,
+    Inactive,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct RpcStakeActivation {
+    pub state: StakeActivationState,
+    pub active: u64,
+    pub inactive: u64,
+}