AttributeError: type object 'AzureOpenAI' has no attribute 'metadata'

> Please provide us with the following information:
> ---------------------------------------------------------------

### This issue is for a: (mark with an `x`)
```
- [ ] bug report -> please search issues before submitting
- metadata function is not available in azureopen ai
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
> pip install openai1.14.1, call metadata method in azureopen ai object

### Any log messages given by the failure
AttributeError: type object 'AzureOpenAI' has no attribute 'metadata'

### Expected/desired behavior
>couldnt load metadata method in azure openai

### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

### Versions
>

### Mention any other details that might be useful

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