refactor(infra): directory structure (#4615)

packages/frontend/native/schema/Cargo.toml

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+[package]
+edition = "2021"
+name = "affine_schema"
+version = "0.0.0"

packages/frontend/native/schema/README.md

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+A temporary crate to share the schema between AFFiNE native and `build.rs` in the AFFiNE native.

packages/frontend/native/schema/src/lib.rs

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+// TODO
+// dynamic create it from JavaScript side
+// and remove this crate then.
+pub const SCHEMA: &str = r#"CREATE TABLE IF NOT EXISTS "updates" (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  data BLOB NOT NULL,
+  timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,
+  doc_id TEXT
+);
+CREATE TABLE IF NOT EXISTS "blobs" (
+  key TEXT PRIMARY KEY NOT NULL,
+  data BLOB NOT NULL,
+  timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL
+);
+CREATE TABLE IF NOT EXISTS "version_info" (
+  version NUMBER NOT NULL,
+  timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL
+)
+"#;