Upgradeable loader (bp #13689) (#14318)

* Upgradeable loader (#13689)

(cherry picked from commit 9e90394583)

# Conflicts:
#	cli/src/cli.rs
#	ledger/src/builtins.rs
#	programs/bpf_loader/src/lib.rs
#	sdk/src/feature_set.rs

* fix conflits

* fix commitment

* fix local cluster test

Co-authored-by: Jack May <jack@solana.com>

programs/bpf/rust/upgradeable/src/lib.rs

@@ -0,0 +1,16 @@
+//! @brief Example Rust-based BPF upgradeable program
+
+extern crate solana_program;
+use solana_program::{
+    account_info::AccountInfo, entrypoint, entrypoint::ProgramResult, msg, pubkey::Pubkey,
+};
+
+entrypoint!(process_instruction);
+fn process_instruction(
+    _program_id: &Pubkey,
+    _accounts: &[AccountInfo],
+    _instruction_data: &[u8],
+) -> ProgramResult {
+    msg!("Upgradeable program");
+    Err(42.into())
+}