Add static analyzer to discourage use of panic() (#15075)

* Implement static analysis to prevent panics

* Add nopanic to nogo

* Fix violations and add exclusions

Fix violations and add exclusions for all

* Changelog fragment

* Use pass.Report instead of pass.Reportf

* Remove strings.ToLower for checking init method name

* Add exclusion for herumi init

* Move api/client/beacon template function to init and its own file

* Fix nopanic testcase

container/leaky-bucket/heap.go

@@ -27,11 +27,12 @@ func (pq priorityQueue) Swap(i, j int) {
 	pq[j].index = j
 }
 
+// Push a LeakyBucket to priorityQueue
 func (pq *priorityQueue) Push(x interface{}) {
 	n := len(*pq)
 	b, ok := x.(*LeakyBucket)
 	if !ok {
-		panic(fmt.Sprintf("%T", x))
+		panic(fmt.Sprintf("%T", x)) // lint:nopanic -- This method should be improved. High risk for misuse!
 	}
 	b.index = n
 	*pq = append(*pq, b)