OAK-9680 Add support for Azure SAS URIs to oak-segment-azure

[jelmini]

Add support for SAS URIs to utility code.

[smiroslav]

Looks good to me.

As a minor comment, not sure that introducing Environment class brings obvious benefits right now.

[jelmini]

@smiroslav I had to introduce the Environment class to be able to test the code. Mockito cannot mock System.getenv() because it's a system class. Alternatively, it's possible to hack a workaround using reflection to obtain the underlying mutable Map from System.getenv(). This works with Java up until 15 with a big warning, but stops working from Java 16 forward (because "illegal reflective access" really becomes illegal).
Is there another approach for testing this code you could suggest?

[smiroslav]

Thanks @jelmini for clarification. There are some test libraries that can inject values for system properties, but I like your approach better.