Missing typed async convenience methods for computed key overloads

[dguisinger]

Problem

The source generator produces typed parameter overloads for builder-returning methods (Get, Delete, Update, ConditionCheck) when an entity has computed keys with 2+ source properties. However, it does not generate the corresponding async convenience methods (GetAsync, DeleteAsync).

The standard (non-computed) flow generates both:

• Get(string pK, string sK) → builder
• GetAsync(string pK, string sK, CancellationToken) → one-shot execution

But the typed overloads only generate the builder variant:

• ✅ Get(int year, int month, int day, string sK) → builder
• ❌ GetAsync(int year, int month, int day, string sK, CancellationToken) → missing

Current workaround

Users must chain the terminal method manually:

var event = await table.ScheduledEvents.Get(2024, 12, 25, "christmas-party").GetItemAsync();
await table.ScheduledEvents.Delete(2024, 12, 25, "christmas-party").DeleteAsync();

Expected behavior

Typed async convenience methods should be generated alongside the builder overloads:

var event = await table.ScheduledEvents.GetAsync(2024, 12, 25, "christmas-party");
await table.ScheduledEvents.DeleteAsync(2024, 12, 25, "christmas-party");

Scope

The following typed async convenience methods should be generated when an entity qualifies for typed overloads:

Method	Signature pattern	Delegates to
GetAsync	Task<T?> GetAsync({typedParams}, CancellationToken)	Get({typedParams}).GetItemAsync(ct)
DeleteAsync	Task DeleteAsync({typedParams}, KeyCondition, CancellationToken)	Delete({typedParams}).WithKeyCondition(kc).DeleteAsync(ct)

Update does not have an async convenience method in the standard flow (requires .Set(...) before execution), so no typed UpdateAsync is needed.

Additional considerations

• GetAsyncResult (FluentResults) variant should also be generated if [UseFluentResults] is present
• DeleteAsyncResult variant likewise
• Table-level typed async methods should mirror the entity accessor ones
• The KeyCondition parameter on DeleteAsync should follow the same pattern as the standard DeleteAsync overloads

Affected code

• TableGenerator.cs
  — GenerateTypedGetOverload and GenerateTypedDeleteOverload need to emit async counterparts after the builder method (same pattern as the standard GenerateAccessorGetMethod / GenerateAccessorDeleteMethod)
• ComputedKeyTypedOverloadsApiSurface.cs
  — add test cases for the new async methods