sdk: Extract last-restart-slot crate (#3272)

* sdk: Extract last-restart-slot crate

#### Problem

Just about all of the sysvars have been extract in some way from
solana-program, but the last restart slot sysvar has not.

#### Summary of changes

Following most of the other crates that have done this, move it out.

* Remove last_restart_slot.rs

Cargo.toml

@@ -435,6 +435,7 @@ solana-gossip = { path = "gossip", version = "=2.1.0" }
 solana-hash = { path = "sdk/hash", version = "=2.1.0", default-features = false }
 solana-inline-spl = { path = "inline-spl", version = "=2.1.0" }
 solana-instruction = { path = "sdk/instruction", version = "=2.1.0", default-features = false }
+solana-last-restart-slot = { path = "sdk/last-restart-slot", version = "=2.1.0" }
 solana-lattice-hash = { path = "lattice-hash", version = "=2.1.0" }
 solana-ledger = { path = "ledger", version = "=2.1.0" }
 solana-loader-v4-program = { path = "programs/loader-v4", version = "=2.1.0" }

sdk/last-restart-slot/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "solana-last-restart-slot"
+description = "Types and utilities for the Solana LastRestartSlot sysvar."
+documentation = "https://docs.rs/solana-last-restart-slot"
+version = { workspace = true }
+authors = { workspace = true }
+repository = { workspace = true }
+homepage = { workspace = true }
+license = { workspace = true }
+edition = { workspace = true }
+
+[dependencies]
+serde = { workspace = true, optional = true }
+serde_derive = { workspace = true, optional = true }
+solana-sdk-macro = { workspace = true }
+
+[features]
+serde = ["dep:serde", "dep:serde_derive"]
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+all-features = true
+rustdoc-args = ["--cfg=docsrs"]

sdk/last-restart-slot/src/lib.rs

@@ -0,0 +1,15 @@
+//! Information about the last restart slot (hard fork).
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+
+use solana_sdk_macro::CloneZeroed;
+
+#[repr(C)]
+#[cfg_attr(
+    feature = "serde",
+    derive(serde_derive::Deserialize, serde_derive::Serialize)
+)]
+#[derive(Debug, CloneZeroed, PartialEq, Eq, Default)]
+pub struct LastRestartSlot {
+    /// The last restart `Slot`.
+    pub last_restart_slot: u64,
+}

sdk/program/Cargo.toml

@@ -53,6 +53,7 @@ solana-instruction = { workspace = true, default-features = false, features = [
     "serde",
     "std",
 ] }
+solana-last-restart-slot = { workspace = true, features = ["serde"] }
 solana-msg = { workspace = true }
 solana-native-token = { workspace = true }
 solana-program-entrypoint = { workspace = true }

sdk/program/src/lib.rs

@@ -487,7 +487,6 @@ pub mod incinerator;
 pub mod instruction;
 pub mod keccak;
 pub mod lamports;
-pub mod last_restart_slot;
 pub mod loader_instruction;
 pub mod loader_upgradeable_instruction;
 pub mod loader_v4;
@@ -522,6 +521,8 @@ pub use solana_borsh::v0_10 as borsh0_10;
 pub use solana_borsh::v1 as borsh1;
 #[deprecated(since = "2.1.0", note = "Use `solana-fee-calculator` crate instead")]
 pub use solana_fee_calculator as fee_calculator;
+#[deprecated(since = "2.1.0", note = "Use `solana-last-restart-slot` crate instead")]
+pub use solana_last_restart_slot as last_restart_slot;
 #[deprecated(since = "2.1.0", note = "Use `solana-program-memory` crate instead")]
 pub use solana_program_memory as program_memory;
 #[deprecated(since = "2.1.0", note = "Use `solana-program-pack` crate instead")]