Add solana-test-validator --warp-slot argument (bp #14785) (#14796)

* Add convenience function to create a snapshot archive out of any Bank

(cherry picked from commit dd5a2ef05f)

* Add solana-test-validator --warp-slot argument

(cherry picked from commit bf1943e489)

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

sdk/program/src/epoch_schedule.rs

@@ -51,6 +51,13 @@ impl EpochSchedule {
     pub fn new(slots_per_epoch: u64) -> Self {
         Self::custom(slots_per_epoch, slots_per_epoch, true)
     }
+    pub fn without_warmup() -> Self {
+        Self::custom(
+            DEFAULT_SLOTS_PER_EPOCH,
+            DEFAULT_LEADER_SCHEDULE_SLOT_OFFSET,
+            false,
+        )
+    }
     pub fn custom(slots_per_epoch: u64, leader_schedule_slot_offset: u64, warmup: bool) -> Self {
         assert!(slots_per_epoch >= MINIMUM_SLOTS_PER_EPOCH as u64);
         let (first_normal_epoch, first_normal_slot) = if warmup {