Runtime feature activation framework (bp #12376) (#12497)

* Runtime feature activation framework

(cherry picked from commit 93259f0bae)

# Conflicts:
#	runtime/src/bank.rs

* Add feature set identifier to gossiped version information

(cherry picked from commit 35f5f9fc7b)

# Conflicts:
#	Cargo.lock
#	version/Cargo.toml

* Port instructions sysvar and secp256k1 program activation to FeatureSet

(cherry picked from commit c10da16d7b)

# Conflicts:
#	runtime/src/bank.rs
#	runtime/src/message_processor.rs

* Add feature management commands

(cherry picked from commit 93ed0ab2bb)

# Conflicts:
#	Cargo.lock
#	cli/Cargo.toml

* Make test_process_rest_api less fragile

(cherry picked from commit 7526bb96f3)

* Remove id field

(cherry picked from commit cc6ba1e131)

* FeatureSet test

(cherry picked from commit 92406cf9a0)

* cargo fmt

(cherry picked from commit 199940d683)

* cli review feedback

(cherry picked from commit 3a2b8c5e5b)

* Rename active() to is_active()

(cherry picked from commit e39fac9f01)

* Resolve merge conflicts

* Remove continues from compute_active_feature_set()

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

client/src/rpc_response.rs

@@ -121,6 +121,7 @@ pub enum ReceivedSignatureResult {
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "camelCase")]
 pub struct RpcContactInfo {
     /// Pubkey of the node as a base-58 string
     pub pubkey: String,
@@ -132,6 +133,8 @@ pub struct RpcContactInfo {
     pub rpc: Option<SocketAddr>,
     /// Software version
     pub version: Option<String>,
+    /// First 4 bytes of the FeatureSet identifier
+    pub feature_set: Option<u32>,
 }
 
 /// Map of leader base58 identity pubkeys to the slot indices relative to the first epoch slot
@@ -142,6 +145,8 @@ pub type RpcLeaderSchedule = HashMap<String, Vec<usize>>;
 pub struct RpcVersionInfo {
     /// The current version of solana-core
     pub solana_core: String,
+    /// first 4 bytes of the FeatureSet identifier
+    pub feature_set: Option<u32>,
 }
 
 impl fmt::Debug for RpcVersionInfo {