feat: implement initial sync backfill job (#196)

Based on #183

This PR adds a backfill job that accepts a DB transaction and copies the
current state to the database. The transaction ensures we see a
consistent view of the database at the current block, even if the node
is syncing. This requires `--db.read-transaction-timeout 0`.

This currently doesn't handle interrupting the job because the state may
update while syncing and may read a different version of the database
upon restart.

---------

Co-authored-by: Arun Dhyani <[email protected]>
Co-authored-by: Emilia Hane <[email protected]>

Author: 3 people

Cargo.lock

@@ -18,6 +18,7 @@ reth-exex.workspace = true
 alloy-primitives = { workspace = true }
 
 # reth
+reth-chainspec.workspace = true
 reth-db-api.workspace = true
 reth-node-types.workspace = true
 reth-node-api.workspace = true
@@ -33,17 +34,21 @@ futures-util.workspace = true
 serde.workspace = true
 thiserror.workspace = true
 tokio.workspace = true
+tracing.workspace = true
 
 # dev dependencies
 [dev-dependencies]
 tokio = { workspace = true, features = ["test-util", "rt-multi-thread", "macros"] }
 test-case.workspace = true
 futures.workspace = true
+reth-db = { workspace = true, features = ["test-utils"] }
 
 [features]
 test-utils = [
     "reth-primitives-traits/test-utils",
     "reth-db-api/test-utils",
     "reth-provider/test-utils",
     "reth-trie/test-utils",
+    "reth-db/test-utils",
+    "reth-chainspec/test-utils",
 ]