[New Segment]: Microsoft Azure Subscription segment (async)

[Iridias]

This segment adds your currently active Microsoft Azure subscription to your prompt.

Fetching is async, as the command can take ~ 2 seconds.

[iilonmasc]

Duplicate, or rather enhancement of #1192 (which was not async)

[iilonmasc]

Would you please add an entry to README.md under Segments? We collect available segments in a list