• Almost all the template (e.g ArmResourceCreateOrUpdateAsync) use @extension("x-ms-long-running-operation-options" to define LRO
• A few LRO template (e.g. ArmResourceActionAsync) uses both of @extension("x-ms-long-running-operation-options") and pollingLocation/finalLocation of typespec-azure-core

• call [attachExtensions](https

For the following Typespec definition about "multipart/form-data":

...
model MultiPartRequest {
  id: string;
  profileImage: bytes;
}

Follow the following steps to generate SDK changelog:

1. Prepare environment (only need once)

(venv-dev) PS D:\dev\azure-sdk-for-python> python .\scripts\dev_setup.py -p azure-core

2. Generate code report for last release

(venv-dev) PS D:\dev\azure-sdk-for-python> python -m packaging_tools.code_report --last-pypi azure-mgmt-rdbms

For multi client configuration(like azure-purview-administration), current python codegen does not generate _version.py in package folder which is needed by setup.py. What's worse, customers need to edit the file manually to update version number before they release package which is very inconvenient.

To solve the problem, we need new Plugin in python codegen. The new Plugin will generate necessary files(_version.py, etc) for multi client package. Customers will configure like: