BAT Points support

[mandar-brave]

Spec posted - please refer.

cc @NejcZdovc @kjozwiak @rebron @mattmcalister

[GeetaSarvadnya]

Verification passed on

Brave	0.71.111 Chromium: 78.0.3904.87 (Official Build) (64-bit)
Revision	20c21f4010010f32462ea8e1d6af30cef66d48c8-refs/branch-heads/3904@{#840}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified the test plan from BAT Points updates for unsupported regions brave-core#3751
• Encountered BAT Points follow-up to #6480 - Changes for Japan #6654 (comment)
• Encountered BAT Points text needed on BR slide of desktop onboarding flow #6602, Change "no tokens" messaging on BR panel for BAT Points regions #6604, Alignment issue for Token grants claimed in BR panel #6684 and BAT Points - BR panel flickering in the nightly build #6685
• Verified the BAT Points display for ads grants as per the spec

• Verified Brave Desktop wallet panel spec and ensured panel items are displayed as mentioned in the spec
  https://docs.google.com/document/d/1Vf9rFeSEPx8KbZYzw_rCyMq8iv5AExU0fhnv3Q6bZe0/edit#heading=h.d6jxemuv7f4j
  

Verification passed on

Brave	0.71.114 Chromium: 78.0.3904.97 (Official Build) (64-bit)
Revision	021b9028c246d820be17a10e5b393ee90f41375e-refs/branch-heads/3904@{#859}
OS	Ubuntu 18.04 LTS

• Verified the test plan from BAT Points updates for unsupported regions brave-core#3751
  
  
  
  
  
  
  
  
  
  

Verification PASSED on macOS 10.15.1 x64 using the following build:

Brave	0.71.114 Chromium: 78.0.3904.97 (Official Build) (64-bit)
Revision	021b9028c246d820be17a10e5b393ee90f41375e-refs/branch-heads/3904@{#859}
OS	macOS Version 10.15.1 (Build 19B88)

• Verified BAT Points text needed on BR slide of desktop onboarding flow #6602
• Verified Change "no tokens" messaging on BR panel for BAT Points regions #6604
• Verified BAT Points follow-up to #6480 - Changes for Japan #6654