Provide More Granular Photo Access

[jhreis]

Description:

Starting in iOS 11, Apple has provided a write-only photo permissions. We should support this, even if never prompted (e.g. only a native Photos permission). This is supported in other browsers (e.g. FF)

Steps to Reproduce

1. Go into Device Settings (not Brave settings)
2. Select Brave from app list
3. Select Photos
4. Select "Add Photos Only"

[magicwave]

In the described Steps to Reproduce, on my iPhone 7, iOS 12 I could not find Photos in the Brave panel from the apps list.

The version I'm running is the 1368a45 commit of the development branch, built to device with Xcode.

On iOS 12+ I think the Device path should be:
Settings > Privacy > Photos > Brave

However I am unable to verify that; there are 3rd party apps in the list but Brave is not among them. Maybe it's because Brave hasn't asked for access permissions to Photos yet, but I can't figure out how to have the Brave app prompt for them.

[iccub]

iOS 13 handles this automatically, so we only need to change iOS 12 behavior
@Brandon-T please correct me if I'm wrong

[srirambv]

Verification passed on iPhone 6 with iOS 12.4.4 running 1.15(20.01.13.17)

• Verified first image save prompts permission to store in Photo app
  
• Verified selecting OK saves the image
• Verified selecting Don't Allow sets permission to Never
• Verified when set to never shows the following prompt
  

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Verification passed on iPhone 6 with iOS 12.4.4 running 1.15(20.01.13.17)

• Verified first image save prompts permission to store in Photo app
  
• Verified selecting OK saves the image
• Verified selecting Don't Allow sets permission to Never
• Verified when set to never shows the following prompt
  

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• Logged Photo app restriction doesn't prompt to change on iOS 13 [Follow up to #903] #2191 for iOS 13