chore: scaffold workspace with nextest and docker compose

Workspace with 6 crates: wfe-core, wfe-sqlite, wfe-postgres,
wfe-opensearch, wfe-valkey, and wfe (umbrella). Nextest profiles
for default, integration, and CI. Docker compose for PostgreSQL,
Valkey, and OpenSearch integration tests.

Cargo.toml

@@ -0,0 +1,45 @@
+[workspace]
+members = ["wfe-core", "wfe-sqlite", "wfe-postgres", "wfe-opensearch", "wfe-valkey", "wfe"]
+resolver = "2"
+
+[workspace.package]
+version = "0.1.0"
+edition = "2024"
+license = "MIT"
+
+[workspace.dependencies]
+# Core
+tokio = { version = "1", features = ["full"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+async-trait = "0.1"
+uuid = { version = "1", features = ["v4", "serde"] }
+chrono = { version = "0.4", features = ["serde"] }
+thiserror = "2"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+# HTTP
+reqwest = { version = "0.12", features = ["json"] }
+
+# Persistence
+sqlx = { version = "0.8", features = ["runtime-tokio", "tls-rustls", "sqlite", "postgres", "chrono", "uuid", "json"] }
+
+# Redis/Valkey
+redis = { version = "0.27", features = ["tokio-comp", "connection-manager"] }
+
+# Search
+opensearch = "2"
+
+# Internal crates
+wfe-core = { path = "wfe-core" }
+wfe-sqlite = { path = "wfe-sqlite" }
+wfe-postgres = { path = "wfe-postgres" }
+wfe-opensearch = { path = "wfe-opensearch" }
+wfe-valkey = { path = "wfe-valkey" }
+
+# Dev/Test
+pretty_assertions = "1"
+rstest = "0.23"
+wiremock = "0.6"
+tokio-stream = "0.1"