No Bug: Update Rewards native libraries and add dev environment support

[kylehickinson]

BATBraveRewardsConfiguration.default is set to dev, but for now keeping things consistent and using staging even for development builds

Summary of Changes

Updates the BraveRewards framework with the following changes from brave-core:

• Adds development env Adds development env brave-core#3294
• Adds contribution queue Adds contribution queue brave-core#3658

Full history: https://github.com/brave/brave-core/commits/master/vendor/brave-ios

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()

Test Plan:

• @srirambv Will need to test contribution queue (Test Plan located in PR: Adds contribution queue brave-core#3658)

Screenshots:

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • release-notes/(include|exclude)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue is assigned to a milestone (should happen at merge time).