Adds development env

[NejcZdovc]

Resolves brave/brave-browser#5722

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:

• Confirm all Brave Rewards server communications work as expected for the server development environment (--brave-ads-development --rewards=development=true command-line arg)
• Confirm all Brave Rewards server communications work as expected for the server staging environment (--brave-ads-staging --rewards=staging=true command-line arg)
• Confirm all Brave Rewards server communications work as expected for the server production environment

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.

[NejcZdovc]

cc @tmancey for ads work

[kylehickinson]

@tmancey Any ETA on this?

[tmancey]

@kylehickinson This work is blocked awaiting development URLs, @NejcZdovc do we have an eta please?

[tmancey]

@tmancey Any ETA on this?

@kylehickinson work completed on libs, changes need to be applied to iOS

[tmancey]

LGTM

[kylehickinson]

Changes will be pulled in once merged

[NejcZdovc]

CI passed as it only failed on audit-deps and this is expected