Add prom histogram for forwarding latency and jitter. (#4044)

* Add prom histogram for forwarding latency and jitter.

Using short term stats for histogram.

An example setting is
1s - short term
1m - long term

Using the 1s (short term) data for histogram. In that 1 second, all
packet forwarding latencies are averaged for latency and std. dev. of
the collection is used as jitter.

* try different staticcheck

.github/workflows/buildtest.yaml

@@ -35,7 +35,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: '^1.24'
+          go-version: "^1.24"
 
       - name: Set up gotestfmt
         run: go install github.com/gotesttools/gotestfmt/v2/cmd/gotestfmt@v2.4.1
@@ -57,7 +57,7 @@ jobs:
           args: build
 
       - name: Static Check
-        uses: amarpal/staticcheck-action@master
+        uses: dominikh/staticcheck-action@v1
         with:
           checks: '["all", "-ST1000", "-ST1003", "-ST1020", "-ST1021", "-ST1022", "-SA1019"]'
           install-go: false