Support promise based tokenGetter in JwtHelperService

[frederikprijck]

Changes

tokenGetter is typed to be able to return a string or a promise. The interceptor can handle when tokenGetter returns a promise, but the JwtHelperService can not.

This PR updates the JwtHelperService in such a way that it can handle Promises.

Note that this does change the public API, but it's not to be considered a breaking change as we actualy fixing incorrect current behavior.

References

Closes #747

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All code quality tools/guidelines in the CONTRIBUTING documentation have been run/followed
• All relevant assets have been compiled as directed in the CONTRIBUTING documentation, if applicable

[codecov]

Codecov Report

Base: 85.71% // Head: 85.71% // No change to project coverage 👍

Coverage data is based on head (9fe1af4) compared to base (b79c495).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #748   +/-   ##
=======================================
  Coverage   85.71%   85.71%           
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  Files           2        2           
  Lines           7        7           
=======================================
  Hits            6        6           
  Misses          1        1           

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