feat: proxy server, add use case test

[x] Registered user creates three conduits to a previously setup contacts NTS:
- (a) conduit-A: write-only (RACM: POST)
- (b) conduit-B: read and write (RACM: GET, PATCH)
- (c) conduit-C: read-only (RACM: GET)
[x] Registered user hands-over conduit-A to a widget-designer
- (a) widget-designer creates a form with conduit-A as the destination of form submission
[x] Registered user publishes a page with the embedded form
- (a) Visitors provide their first-name and email | N submissions
- (b) Bots have a field day and spam the heck out on the gateway | M submissions
[x] Registered user hands-over conduit-B to a 3rd party email validation service (EVS)
- (a) EVS reads data using conduit-B and verifies if the email address is valid | by roll of a die
- (b) EVS marks a row using conduit-B, to contain a valid email or not
[x] Registered user hands-over conduit-C to a reports and visualization service (RAVS)
- (a) RAVS reads data using conduit-C and prepares a report
- (b) The report contains: signups, valid-email, invalid-email | by day, by week, by month

million-views / praas