chore: consolidate user_data and refresh_token_params annotations

[nijel]

Considilate API and type annotations for user_data and refresh_token_params method on OAuth backends.

[codecov]

Codecov Report

❌ Patch coverage is 70.29703% with 90 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.96%. Comparing base (6cd7cbb) to head (a925b7a).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
social_core/backends/classlink.py	0.00%	3 Missing ⚠️
social_core/backends/clever.py	0.00%	3 Missing ⚠️
social_core/backends/douban.py	0.00%	3 Missing ⚠️
social_core/backends/eveonline.py	0.00%	3 Missing ⚠️
social_core/backends/rdio.py	0.00%	3 Missing ⚠️
social_core/backends/vimeo.py	0.00%	3 Missing ⚠️
social_core/backends/weibo.py	0.00%	3 Missing ⚠️
social_core/backends/appsfuel.py	0.00%	2 Missing ⚠️
social_core/backends/azuread_tenant.py	0.00%	2 Missing ⚠️
social_core/backends/battlenet.py	0.00%	2 Missing ⚠️
... and 35 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1452      +/-   ##
==========================================
- Coverage   79.06%   78.96%   -0.10%     
==========================================
  Files         352      352              
  Lines       11333    11461     +128     
  Branches      527      527              
==========================================
+ Hits         8960     9050      +90     
- Misses       2193     2231      +38     
  Partials      180      180              

Flag	Coverage Δ
unittests	78.96% <70.29%> (-0.10%)	⬇️

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