Azure-cli: az policy set-definition create is missing metadata argument

[bgelens]

Describe the bug
az policy set-definition create is missing the metadata argument. This is necessary to provide, among else, the category information.

This is similar to #5798

Environment summary
Install Method (e.g. pip, interactive script, apt-get, Docker, MSI, edge build) / CLI version (az --version) / OS version / Shell Type (e.g. bash, cmd.exe, Bash on Windows)

azure-cli                         2.0.74

command-modules-nspkg              2.0.3
core                              2.0.74
nspkg                              3.0.4
telemetry                          1.0.3

Extensions:
aks-preview                        0.4.5
azure-devops                      0.13.0

Python location '/usr/local/Cellar/azure-cli/2.0.74/libexec/bin/python'
Extensions directory '/Users/bengelens/.azure/cliextensions'

Python (Darwin) 3.7.4 (default, Sep  7 2019, 18:27:02) 
[Clang 10.0.1 (clang-1001.0.46.4)

[Juliehzl]

Hi@bgelens, we will add metadata soon.

[yonzhan]

How is the status of this issue?