[V1] [Social] Fix state bad URL characters

[LoicPoullain]

Issue

Fixes #754.

Solution and steps

• In AbstractProvider, generate base64url-encoded tokens.

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (v1-12-2@3e7ee2f). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             v1-12-2     #912   +/-   ##
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  Coverage           ?   99.59%           
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  Files              ?       94           
  Lines              ?     1730           
  Branches           ?      391           
==========================================
  Hits               ?     1723           
  Misses             ?        7           
  Partials           ?        0           

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