*: replace interface{} with any keyword

Everywhere including examples, external interop APIs, bindings generators
code and in other valuable places. A couple of `interface{}` usages are
intentionally left in the CHANGELOG.md, documentation and tests.

pkg/compiler/testdata/util/equals.go

@@ -1,6 +1,6 @@
 package util
 
 // Equals is a mirror of `Equals` builtin.
-func Equals(a, b interface{}) bool {
+func Equals(a, b any) bool {
 	return true
 }