Add configuration to trailing_closure to enable/disable properties

[marcelofabri]

From #1193 (comment):

---

Even as opt-in I think it needs work. For example, I wouldn't consider accessing the property after a call to a closure to require it to use trailing closure syntax, such as the first OSSCheck violation reported here:

XCTAssertEqual(1, schema.objectSchema.filter({ $0.className == "SwiftStringObject" }).count)

[jshier]

In addition to this configuration, it would be nice to disable for empty closures. For instance, WKAlertAction requires a handler, but using trailing closure syntax with it seems weird.
This:

WKAlertAction(title: "Title",
              style: .cancel,
              handler: { })

vs.

WKAlertAction(title: "Title",
              style: .cancel) { }

[weakfl]

Any update?

[stale]

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