Refactor resize event payload to ResizeEventArgs

[zxyao145]

Motivation

• Consolidate the window.onresize payload into a single typed object to simplify event signatures and caller code.
• Remove the two-parameter event plumbing (EventSlot<T1, T2>) which is no longer needed once resize uses an object.

Description

• Added ResizeEventArgs DTO with Width and Height properties (src/BQuery/Dtos/ResizeEventArgs.cs).
• Switched WindowEvent.OnResize metadata to use ResizeEventArgs instead of two double arguments (src/BQuery/Constants/WindowEvents.cs).
• Removed the unused EventSlot<T1, T2> implementation from BqEvents and retained the single-argument EventSlot<T> (src/BQuery/BqEvents.cs).
• Updated JS interop to invoke WindowResize with an object payload { width, height } and rebuilt the JS bundle (src/BQuery/wwwroot/src/module/eventHelper.ts, src/BQuery/wwwroot/bQuery.min.js).
• Updated the sample handler to accept ResizeEventArgs and updated README/API docs to reflect the new signatures (Sample/BQuery.Sample.Common/Pages/Index.razor, README.md, API.md).

Testing

• Ran pnpm install in src/BQuery/wwwroot and it completed successfully.
• Ran pnpm build in src/BQuery/wwwroot and the frontend bundle was built successfully producing an updated bQuery.min.js.
• Attempted dotnet build /workspace/BQuery/BQuery.sln but the command could not be executed in this environment because dotnet is not installed.

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Codex Task