add save jwt method

[Tiska]

No description provided.

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (ce9f6e4) 58.84% compared to head (14817d0) 55.21%.

❗ Current head 14817d0 differs from pull request most recent head ca196e8. Consider uploading reports for the commit ca196e8 to get more accurate results

Files	Patch %	Lines
lib/messages.dart	0.00%	10 Missing ⚠️
lib/flutter_google_wallet_pigeon.dart	0.00%	2 Missing ⚠️
lib/flutter_google_wallet_platform_interface.dart	0.00%	2 Missing ⚠️
lib/flutter_google_wallet_plugin.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   58.84%   55.21%   -3.64%     
==========================================
  Files          14       14              
  Lines         243      259      +16     
==========================================
  Hits          143      143              
- Misses        100      116      +16     

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