HTTP endpoints which provide meta information of running flogo app

[pointlander]

I'm submitting a ... (check one with "x")

[] bug report => search github for a similar issue or PR before submitting
[] enhancement request
[x] feature request
[] support request
[] general question

Current behavior (how does the issue manifest):
Accessing meta information of a running flogo app over the network is currently not supported.

Expected behavior:
A request to the endpoint /ping will return the name, version, and description of the flogo app. A request to the endpoint /stats will return information such as memory utilization. A request to the endpoint /swagger.json will return swagger based off of the rest triggers. The endpoints will be served off of a configurable port.

Minimal steps to reproduce the problem (not required if feature enhancement):

What is the motivation / use case for changing the behavior?
It will be possible to remotely see if a flogo app is running, its supported API, and the resources it is consuming.

Please tell us about your environment (Operating system, docker version, browser & verison if webui, etc):

Flogo version (CLI & contrib/lib. If unknown, leave empty or state unknown): 0.X.X

Additional information you deem important (e.g. issue happens only occasionally):