[ENH] Add the schema for Rust Log Service in Spanner. (#6096)

## Description of changes

This PR is the schema for the replicated log.

## Test plan

CI

## Migration plan

N/A

## Observability plan

N/A

## Documentation Changes

N/A

Author: rescrv

rust/spanner-migrations/log_migrations/0001-create_manifests_table.spanner.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS manifests (
+    log_id STRING(36) NOT NULL,
+    setsum STRING(64) NOT NULL,
+    collected STRING(64) NOT NULL,
+    acc_bytes INT64 NOT NULL,
+    writer STRING(64) NOT NULL,
+    enumeration_offset INT64 NOT NULL
+) PRIMARY KEY (log_id);

rust/spanner-migrations/log_migrations/0002-create_fragments_table.spanner.sql

@@ -0,0 +1,10 @@
+CREATE TABLE IF NOT EXISTS fragments (
+    log_id STRING(36) NOT NULL,
+    ident STRING(36) NOT NULL,
+    path STRING(64) NOT NULL,
+    position_start INT64 NOT NULL,
+    position_limit INT64 NOT NULL,
+    num_bytes INT64 NOT NULL,
+    setsum STRING(64) NOT NULL
+) PRIMARY KEY (log_id, ident),
+    INTERLEAVE IN PARENT manifests ON DELETE NO ACTION;

rust/spanner-migrations/log_migrations/0003-create_fragment_regions_table.spanner.sql

@@ -0,0 +1,6 @@
+CREATE TABLE IF NOT EXISTS fragment_regions (
+    log_id STRING(36) NOT NULL,
+    ident STRING(36) NOT NULL,
+    region STRING(32) NOT NULL
+) PRIMARY KEY (log_id, ident, region),
+    INTERLEAVE IN PARENT fragments ON DELETE NO ACTION;

rust/spanner-migrations/log_migrations/log_migrations.sum

@@ -1,4 +1,8 @@
 # Spanner migrations manifest - DO NOT EDIT MANUALLY
-# Format: {filename} {sha256_hash}
+# Format: {filename} {running_sha256_hash}
 # This file protects against merge conflicts and forgotten migration files.
-# Run `cargo run --bin spanner_migration -- --generate-sum` to regenerate.
+# Run `cargo run --bin spanner_migration -- generate-sum` to regenerate.
+
+0001-create_manifests_table.spanner.sql f035d1216ff440fbf43c6337039143b6de805c91a01ae25b6440b329381eaf5a
+0002-create_fragments_table.spanner.sql 1867b6d5b9189b59a9ca83faeafe337883924315b50d5302c2058534fabe6d55
+0003-create_fragment_regions_table.spanner.sql dbc683e9c0b7ac9295e233beec807998b1b0dc274185c5c40585af088221d4f0

rust/spanner-migrations/migrations/migrations.sum

@@ -1,7 +1,7 @@
 # Spanner migrations manifest - DO NOT EDIT MANUALLY
 # Format: {filename} {running_sha256_hash}
 # This file protects against merge conflicts and forgotten migration files.
-# Run `cargo run --bin spanner_migration -- --generate-sum` to regenerate.
+# Run `cargo run --bin spanner_migration -- generate-sum` to regenerate.
 
 0001-create_tenants.spanner.sql 87dbaa652753aba0730b9b784a2974f0b23c2017b562ec9f0b01663d9c840321
 0002-create_databases.spanner.sql e07d1f1b3d7c9ac2d7df289b7da4b46602c350a3b7589444cde87ece30db4fa8