[C++][Azure] Add ApplicationId to AzureFileSystem

[nateprewitt]

Describe the enhancement requested

This issue is proposing modification of the User Agent identifier used in calls from AzureFileSystem to Azure Storage backends. This addition is part of existing Azure C++ SDK functionality and will make it easier to identify requests coming from Arrow/PyArrow rather than a stand-alone C++ SDK.

Would the Arrow team be open to accepting a PR for this? I have example code here which is tested and should be ready to submit if this would be an acceptable enhancement.

The proposed code prepends a azpartner-arrow/{version} identifier to the HTTP User-Agent Header using the current build version. Here are some examples on precedent for updating other libraries/frameworks to use this format:

NIXL Azure Blob Client
Langchain Azure Storage

Component(s)

C++

[kou]

Could you open a PR from the branch?

I'm not sure azparter-arrow/ is suitable for our identifier. Where does azpartner- come from?

[nateprewitt]

I'm not sure azpartner-arrow/ is suitable for our identifier. Where does azpartner- come from?

I agree it's an odd designation. This covers any third-party tooling (not Microsoft authored) calling Azure. I've confirmed this is the intended identifier for a library like Arrow. Whether you want to add this though is up to you. It's primarily to help disambiguate tooling issues by adding a finer grained identifier.

Let me know what your thoughts are and I can put up the PR if you'd still like me to move forward.