logging: adds memory scope (#1076)

This allows you to specify the memory scope amongst existing logging scopes, both in API and the CLI.

e.g for the CLI.
```bash
$ wazero run --hostlogging=memory,filesystem --mount=.:/:ro cat.wasm
```

e.g. for Go
```go
loggingCtx := context.WithValue(testCtx, experimental.FunctionListenerFactoryKey{},
	logging.NewHostLoggingListenerFactory(&log, logging.LogScopeMemory|logging.LogScopeFilesystem))
```

This is helpful for emscripten and gojs which have memory reset
callbacks. This will be much more interesting once #1075 is implemented.

Signed-off-by: Adrian Cole <adrian@tetrate.io>

internal/logging/logging.go

@@ -41,6 +41,7 @@ const (
 	LogScopeClock LogScopes = 1 << iota
 	LogScopeExit
 	LogScopeFilesystem
+	LogScopeMemory
 	LogScopePoll
 	LogScopeRandom
 	LogScopeAll = LogScopes(0xffffffffffffffff)
@@ -54,6 +55,8 @@ func scopeName(s LogScopes) string {
 		return "exit"
 	case LogScopeFilesystem:
 		return "filesystem"
+	case LogScopeMemory:
+		return "memory"
 	case LogScopePoll:
 		return "poll"
 	case LogScopeRandom: