Add support for SAS URIs for table clients

[tomas-pajurek]

Clients for storage tables should be constructable from URIs containing SAS tokens and their methods for generating SAS URIs/tokens should work as expected.

InMemoryTableServiceClient

• InMemoryTableServiceClient(Uri endpoint, ...) ctors.
• GenerateSasUri method.
• GetSasBuilder method.

InMemoryTableClient

• InMemoryTableClient(Uri endpoint, ...) ctors.
• GenerateSasUri method.
• GetSasBuilder method.

See #27 for corresponding issue for blob clients.