feat: Enable new storage layer

This commit enables the new storage layer based on log-structured merge
trees (LSMT). The new design allows us to improve checkpointing by
replacing reflinks with hardlinks. This is particularly beneficial to
performance with large canister states.

rs/config/src/state_manager.rs

@@ -47,7 +47,7 @@ fn file_backed_memory_allocator_default() -> FlagStatus {
 
 pub fn lsmt_config_default() -> LsmtConfig {
     LsmtConfig {
-        lsmt_status: FlagStatus::Disabled,
+        lsmt_status: FlagStatus::Enabled,
         // 40GiB
         // DO NOT CHANGE after LSMT is enabled, as it would crash the new replica trying to merge
         // old data.