Add buffer-managed-state design doc and swap-extent buffer pool prototype

Cargo.toml

@@ -641,6 +641,11 @@ debug-assertions = true
 # merged), after which point it becomes impossible to build that historical
 # version of Materialize.
 [patch.crates-io]
+# Chunk-API migration: differential master-next plus the UnloadChunk bulk-read
+# capability, from the `unload-chunk` branch.
+differential-dataflow = { git = "https://github.com/DAlperin/differential-dataflow.git", rev = "b27ad576c5634afc345b446f81ef686d403b9514" }
+differential-dogs3 = { git = "https://github.com/DAlperin/differential-dataflow.git", rev = "b27ad576c5634afc345b446f81ef686d403b9514" }
+
 # Waiting on https://github.com/sfackler/rust-postgres/pull/752.
 postgres = { git = "https://github.com/MaterializeInc/rust-postgres" }
 tokio-postgres = { git = "https://github.com/MaterializeInc/rust-postgres" }

deny.toml

@@ -322,4 +322,8 @@ unknown-registry = "deny"
 # remain buildable even if upstream Git repositories disappear. If you don't
 # have permissions to create a fork in the MaterializeInc organization, ask in
 # #eng-infra on Slack.
-allow-org = { github = ["MaterializeInc"] }
+#
+# TODO: `DAlperin` carries the differential-dataflow Chunk-API prototype branch
+# this development branch builds against; fork it into MaterializeInc (or land
+# it upstream) before merging.
+allow-org = { github = ["MaterializeInc", "DAlperin"] }