[Tables] Fix Shared Key auth and update Readme

[joheredi]

SharedKey auth was broken since the authentication pipeline was not being created correctly and also the construction of the Canonicalized resource was faulty.

Fix:

• Explicitly pass the auth pipeline to the Client contructor
• Switch to SharedKey Lite format which simplifies getting the canonicalized resource.
• Moved getAccountConnectionString method to make sure we fail fast on browsers as it is not supported

I'm also including a couple of updates to the readme to fix small issues I noticed while running the samples

[ellismg]

I trust that this behaves as expected, but is it easy enough for us to write a recorded test that gives us some coverage when using an account key so we have at least some coverage in our matrix?

[ellismg]

LGTM - Thanks for adding the test. On small piece of feedback on one of the guards we have in a test, but it's not blocking.

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[joheredi]

/azp run js - tables - ci

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