Add Warning to Module Tree if Ambiguous Wildcards Detected

[dethell]

While it is invalid API spec to have two wildcard paths at the same path defined (see issue #1308) it is possible to end up in a state where you have two such as the referenced issue or from just manually creating a second endpoint. The module-tree.ts class has enough logic in place to be aware that more than a single leaf wildcard path has been found for a given path. We should at the least show a console log warning when this is detected to raise awareness to the consumer.

[pmcelhaney]

Also maybe send a 500 response when that happens? Fail fast and loud.