Support QueryFragment segments (#76)

* Support `QueryFragment` segments

The next release of StructuredQueries has improved the query fragment
type and the interfaces used by SharingGRDB have been deprecated. Let's
consume the latest APIs.

* wip

Author: stephencelis

Examples/Examples.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -33,7 +33,7 @@ let package = Package(
     .package(url: "https://github.com/pointfreeco/swift-dependencies", from: "1.9.0"),
     .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "1.5.0"),
     .package(url: "https://github.com/pointfreeco/swift-sharing", from: "2.3.0"),
-    .package(url: "https://github.com/pointfreeco/swift-structured-queries", from: "0.4.0"),
+    .package(url: "https://github.com/pointfreeco/swift-structured-queries", from: "0.7.0"),
   ],
   targets: [
     .target(

Package.resolved

@@ -130,12 +130,12 @@ final class QueryVoidCursor: QueryCursor<Void> {
 extension Database {
   @inlinable
   func prepare(query: QueryFragment) throws -> (GRDB.Statement, SQLiteQueryDecoder) {
-    let queryString =
-      query.isEmpty
-      ? "SELECT 1 WHERE 0 -- Empty query generated by StructuredQueries"
-      : query.string
-    let statement = try makeStatement(sql: queryString)
-    statement.arguments = try StatementArguments(query.bindings.map { try $0.databaseValue })
+    var (sql, bindings) = query.prepare { _ in "?" }
+    if sql.isEmpty {
+      sql = "SELECT 1 WHERE 0 -- Empty query generated by StructuredQueries"
+    }
+    let statement = try makeStatement(sql: sql)
+    statement.arguments = try StatementArguments(bindings.map { try $0.databaseValue })
     return (
       statement,
       SQLiteQueryDecoder(statement: statement.sqliteStatement)