LibSQL: Immediately commit database modifications (for now)

This ensures tables survive the database connection quitting. LibSQL
does not have transactional sessions yet, and probably won't for a
while, so let's just commit each modification as it comes.

Userland/Libraries/LibSQL/AST/Statement.cpp

@@ -14,7 +14,12 @@ namespace SQL::AST {
 ResultOr<ResultSet> Statement::execute(AK::NonnullRefPtr<Database> database) const
 {
     ExecutionContext context { move(database), this, nullptr };
-    return execute(context);
+    auto result = TRY(execute(context));
+
+    // FIXME: When transactional sessions are supported, don't auto-commit modifications.
+    TRY(context.database->commit());
+
+    return result;
 }
 
 }

Userland/Libraries/LibSQL/Database.cpp

@@ -66,17 +66,7 @@ ErrorOr<void> Database::open()
     return {};
 }
 
-Database::~Database()
-{
-    // This crashes if the database can't commit. It's recommended to commit
-    // before the Database goes out of scope so the application can handle
-    // errors.
-    // Maybe we should enforce that by having a VERIFY here that there are no
-    // pending writes. But that's a new API on Heap so let's not do that right
-    // now.
-    if (is_open())
-        MUST(commit());
-}
+Database::~Database() = default;
 
 ErrorOr<void> Database::commit()
 {