Clearer middleware chain

[pennane]

Making it safer & more consistent to use the middleware chain with minor changes.

1. Middleware.setNext() is now required

   • No reason to not have it required. Before this change it is impossible to add middleware after the default HTTPMessageHandler.

2. Middleware.#nextMiddleware is made optional

   • Given that the users can use the default middleware served by this sdk we cannot be sure that nextMiddleware is always set.

3. HTTPClientFactory.createWithAuthenticationProvider uses the MiddlewareFactory.getDefaultMiddlewareChain internally

   • The logic of MiddlewareFactory.getDefaultMiddlewareChain was duplicated prior in HTTPClientFactory.createWithAuthenticationProvider which could result to accidental logic diversion.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature(ish) (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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