[Python APIView] parser support restructure for tree tokens

[maririos]

As part of https://github.com/Azure/azure-sdk-tools/issues/5897, the language parsers need to be updated to the new tree structure format.

Documentation can be found here: https://github.com/Azure/azure-sdk-tools/blob/main/tools/apiview/parsers/CONTRIBUTING.md

### Work from APIView team
- [ ] Enable Python in APIView
- [ ] Convert existing reviews
- [ ] Test changes in Staging
- [ ] Deploy changed to Prod
- [ ] Address any cleanup issue
- [ ] https://github.com/Azure/azure-sdk-tools/issues/8915

### Work for Python team
- [ ] Convert parser
- [ ] Test changes in staging

[tjprescott]

https://github.com/Azure/azure-sdk-tools/blob/dd99fc093b9056c3602adada38a4f289cd53d332/tools/apiview/parsers/CONTRIBUTING.md