Add a test case involving cds.serve(..).with(..)

Add a `cds.serve(...).with(...)` that expands the
functionality of Service3 which lacks a CDS declaration.

Since Service3 is missing a CDS declaration, all of the
handlers registrated in the `.with` method call should
be considered as exposed.

Author: jeongsoolee09

javascript/frameworks/cap/test/models/cds/remoteflowsources/ExposedServices.expected

@@ -1,4 +1,5 @@
 | server.js:7:32:7:34 | req |
+| server.js:11:32:11:34 | req |
 | srv/service1.js:6:29:6:31 | req |
 | srv/service1.js:12:29:12:31 | req |
 | srv/service1.js:18:29:18:31 | req |

javascript/frameworks/cap/test/models/cds/remoteflowsources/server.js

@@ -5,4 +5,8 @@ cds.serve("all").in(app);
 
 cds.serve('Service1').with((srv) => {
   srv.before('READ', 'Books', (req) => req.reply([])) // SAFE: Exposed service (fallback), but not a taint source
+})
+
+cds.serve('Service3').with((srv) => {
+  srv.before('READ', 'Books', (req) => req.reply([])) // SAFE: Exposed service (fallback), but not a taint source
 })