Remove unneeded ConnectionInterface methods getState(), getOptions(), setOptions() and getServerOptions()

[clue]

This simple PR removes the (mostly under-documented) getState(), getOptions(), setOptions() and getConnectionOptions() methods from the ConnectionInterface. As of #64 and #65 the connection state is handled internally and is nothing consumers should have to worry about. Similarly, this now uses a URI for connecting instead of connection options.

This is a BC break obviously, but empirical evidence including our examples suggests this should not affect most consumers.

Builds on top of #64 and #65

[jsor]

The creation of the mock should be done outside the callback to ensure it is tracked by PHPUnit.

$quitMock = $this->expectCallableOnce();

$conn->ping()->then(function () use ($conn, $quitMock) {
    $conn->quit()->then($quitMock);
});

[clue]

Good catch, updated 👍

[iNewLegend]

Why getState() was deleted?, i found it useful - there is no way to access it. or i missing something?

[clue]

@clue As of #64 and #65 the connection state is handled internally and is nothing consumers should have to worry about.

@iNewLegend Why getState() was deleted?, i found it useful - there is no way to access it. or i missing something?

Perhaps you can elaborate on your use case and what you need this for? It's my understanding this should be obsolete for the new interfaces. Also, removing this allows us to build lazy connections and connection pools (#27) in the future (pseudo-connections that are in an "idle" state and automatically connect on demand) 👍