Add go profiling for CI NSM images

[denis-tingaikin]

To improve our CI testing we can add a CPU/memory profile capturing for each NSM application via docker target stage. This will allow us to detect memory/cpu regressions or improvements.

Implementation details

1. Add for each application a new target ci

   FROM go as ci
   WORKDIR /build
   COPY go.mod go.sum ./
   COPY ./internal/imports imports
   RUN go build ./imports
   COPY . .
   # TODO: Consider about adding a race flag
   RUN go build -tags=ci -o /bin/app .
   # TODO: correct this:
   ENTRYPOINT ["go", "tool pprof app profile.output"]

2. Add build tags based main.go for the application that will include import _ "net/http/pprof"
3. Build image for the /ci with --target ci
4. Add storing profile.output into https://github.com/networkservicemesh/integration-tests/tree/main/extensions/logs on test cleanup as CI artifact.

[denis-tingaikin]

@edwarnicke Can we schedule this?