[DISCUSS] Plugins: [repository-azure] support OkHttp client

[reta]

Is your feature request related to a problem? Please describe.
In scope of the #1225, the repository-azure is switching to Azure v12 SDK, using Netty as underlying HTTP transport client. However, Azure v12 SDK also supports OkHttp client and it might be beneficial to provide the way to using this one instead.

Describe the solution you'd like
Allow to configure the underlying HTTP transport client: netty or okhttp. It should be able to be implemented as a new transport module (transport-okhttp) alternative to transport-netty4.

Describe alternatives you've considered
N/A

Additional context
Okio is leaking threads (square/okio#107) as well as OkHttp (square/okhttp#6173) so it will incur some workarounds in order to properly test Azure v12 SDK with OkHttp client.

CC @nknize