Uphold wallet

[NejcZdovc]

Resolves brave/brave-browser#5005
Resolves brave/brave-browser#5004
Resolves brave/brave-browser#4774
Resolves brave/brave-browser#4776
Resolves brave/brave-browser#4775
Resolves brave/brave-browser#4779

UI PR: brave/brave-ui#497

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protection-Mode
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

1. Linking

• clean profile
• enable rewards
• click on Verify wallet
• make sure that you see on boarding
• make sure that you are redirected to uphold side
• sign in or create account (try with new profile, existing profile and existing kyc'd profile)
• make sure that you are redirected back to rewards page
  • if you signed in with KYC'd account you should see green button saying verified
  • if you signed in with a regular account you should be redirected to uphold kyc page

2. Contribution

• clean profile
• enable rewards
• link to kyc'd wallet
• tip one verified publisher
• make sure that in your uphold account you see two transactions (5% that goes to brave and 95% that went to the publisher)

3. Claim

• clean profile
• enable rewards
• recover wallet that was self funded
• link to kyc'd wallet
• make sure that user funds from anon wallet are transferred to uphold account that you connected

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[tmancey]

LGTM++

[evq]

re-approving / merging as since last code owner approval this has only undergone a rebase where there was a single conflict in a mojo file