add passive staking and rewards (#3579)

* add stake stuff

* more generic

* test decode bail cases

* favor early returns

programs/stake_program/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "solana-stake-program"
+version = "0.13.0"
+description = "Solana stake program"
+authors = ["Solana Maintainers <maintainers@solana.com>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[dependencies]
+log = "0.4.2"
+solana-logger = { path = "../../logger", version = "0.13.0" }
+solana-sdk = { path = "../../sdk", version = "0.13.0" }
+solana-stake-api = { path = "../stake_api", version = "0.13.0" }
+
+[lib]
+name = "solana_stake_program"
+crate-type = ["cdylib"]
+

programs/stake_program/src/lib.rs

@@ -0,0 +1,3 @@
+use solana_stake_api::stake_instruction::process_instruction;
+
+solana_sdk::solana_entrypoint!(process_instruction);