This allows you to specify the poll scope amongst existing logging scopes, both in API and the CLI.
e.g for the CLI.
```bash
$ wazero run --hostlogging=poll --hostlogging=filesystem --mount=.:/:ro cat.wasm
```
e.g. for Go
```go
loggingCtx := context.WithValue(testCtx, experimental.FunctionListenerFactoryKey{},
logging.NewHostLoggingListenerFactory(&log, logging.LogScopePoll|logging.LogScopeFilesystem))
```
This is particularly helpful to understand side-effects of GC. For
example, in `GOOS=js` GC will trigger events and these have been tricky
to troubleshoot in the past.
Signed-off-by: Adrian Cole <adrian@tetrate.io>
9cf07b4d44