Add project files.

src/modules/Elsa.Sql/Contracts/ISqlEvaluator.cs

@@ -0,0 +1,26 @@
+using Elsa.Expressions.Models;
+using Elsa.Sql.Models;
+using JetBrains.Annotations;
+
+namespace Elsa.Sql.Contracts;
+
+/// <summary>
+/// Evaluates SQL expressions.
+/// </summary>
+[PublicAPI]
+public interface ISqlEvaluator
+{
+    /// <summary>
+    /// Evaluates a SQL expression.
+    /// </summary>
+    /// <param name="expression">The expression to evaluate.</param>
+    /// <param name="context">The context in which the expression is evaluated.</param>
+    /// <param name="options">A set of options.</param>
+    /// <param name="cancellationToken">An optional cancellation token.</param>
+    /// <returns>The <see cref="EvaluatedQuery"/> result.</returns>
+    Task<EvaluatedQuery> EvaluateAsync(
+        string expression,
+        ExpressionExecutionContext context,
+        ExpressionEvaluatorOptions options,
+        CancellationToken cancellationToken = default);
+}