🚀 Feature: Python SDK does not validate row data against table schema before insertion

### 🔖 Feature description

The Python SDK allows defining table schemas (required fields, data types, defaults), but create_row does not perform any client-side validation against this schema.

As a result, issues like missing required fields or incorrect data types are only caught server-side after the API request, leading to delayed and less clear errors.

### 🎤 Pitch

The Python SDK already has full knowledge of the table schema at creation time (required fields, data types, defaults), but this information is not used when inserting rows. This leads to avoidable runtime errors that are only discovered after a network request.

* Adding optional client-side validation would:

* Catch simple mistakes (missing required fields, wrong data types) immediately

* Provide clearer, Python-native error messages

* Reduce unnecessary API calls and debugging time

* Improve onboarding and overall developer experience

This does not replace server-side validation, but complements it by shifting basic checks closer to the developer.

### 👀 Have you spent some time to check if this issue has been raised before?

- [x] I checked and didn't find similar issue

### 🏢 Have you read the Code of Conduct?

- [x] I have read the [Code of Conduct](https://github.com/appwrite/appwrite/blob/master/CODE_OF_CONDUCT.md)

首先定位 Python SDK 的 create_row 入口点及其使用的表模式定义。确定必填字段、数据类型和默认值是如何表示的，然后定义针对无效行的验证行为和 Python 原生错误，同时保留服务器端验证。

由索引模型根据 Issue 内容生成。