Option to add Storage Options through the config instead of having to create a custom Storage Bean

**Is your feature request related to a problem? Please describe.**
Currently in order to customize the Storage Bean for things like retries and timeouts, the only way seems to be to initialize a custom bean like so
```
@Bean
public Storage storage() {
RetrySettings retrySettings = RetrySettings.newBuilder()
.setInitialRetryDelay(Duration.parse(initialRetryDelay))
.setRetryDelayMultiplier(retryDelayMultiplier)
.setMaxRetryDelay(Duration.parse(maxRetryDelay))
.setMaxAttempts(maxAttempts)
.setTotalTimeout(Duration.parse(totalTimeout))
.build();

return StorageOptions.newBuilder()
.setRetrySettings(retrySettings)
.build()
.getService();
}
```

**Describe the solution you'd like**
It would be super convenient to have the ability to provide these configurations in the application.properties file itself to be picked up during auto-configuration of the bean. For eg.

```
gcp:
storage:
retry:
initial-retry-delay: 1s
retry-delay-multiplier: 2.0
max-retry-delay: 10s
max-attempts: 5
total-timeout: 1m
```

Start by locating the Storage auto-configuration and its existing application property bindings. Compare the requested retry settings with the StorageOptions configuration shown in the issue; done means the listed properties are accepted from application.properties and applied when the Storage bean is auto-configured.

Written by the indexing model from the issue text.