Issue with Generating Key-Value Pairs from CMS 1500 Form

Hi,
I am working on reading the form and processing data from CMS 1500 using the provided code. However, I have noticed several issues with the key-value pair generation. The current implementation fails to fetch many details from the form accurately and incorrectly processes some elements. [REPO LINK ](https://github.com/aws-samples/amazon-textract-code-samples/blob/3fb9e1cd3c0a8035aa623f0efe79a16a310f758a/python/extraction-parsers/cms1500-parser.ipynb)
Problems Encountered:
- Many key-value pairs are not being extracted correctly.
- Some values are not being associated correctly with their keys.
- The code seems unable to handle certain sections of the form, such as tables.

In your test sample form I am not seeing any of the details belongs to the table
Please do respond asap :(

打开 extraction-parsers/cms1500-parser.ipynb，并针对所引用的 CMS 1500 测试样本运行它。检查生成的键值对，尤其是表格部分，并将其与表单图像进行比较；当缺失的详细信息和键关联都被准确提取时，该 issue 即完成。

由索引模型根据 Issue 内容生成。