Add optional for storage permission on Android

[nghiashiyi]

Description

Sometimes, developers don't need require WRITE STORAGE in android in their purpose. So it will a bit annoying to user when the storage permission was asked, so I hope it should have an option to ignore STORAGE permission

Checklist

Before creating any Pull Request, confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).

• [x] 📕 I read the Contributing page.
• [x] 🤝 I match the actual coding style.
• [x] ✅ I ran flutter analyse without any issues.

Breaking Change

• [x] 🛠 My feature contain breaking change.

If your feature break something, please detail it

[ghost]

Thanks for submitting this PR, we will review it asap :)

[g-apparence]

• [ ] There is some print comment to remove
• [ ] nested if refactoring

Hard to maintain

if (permissions.isEmpty()) {
        permissions.add(CAMERA);
        if (!ignoreExternalStorage) {
            permissions.add(WRITE_EXTERNAL_STORAGE);
        }
    }

• [ ] making a not on ignoreExternalStorage makes it hard to read. Prefer simplify condition by reversing it (bool externalStorage)

I'll had some more if you want work on this. Sorry for the delay.