[SDK-1634] Pass custom options to the token endpoint

[stevehobbsdev]

Description

This fixes the ability to send custom options when using getTokenSilently in conjunction with using refresh tokens.

When using custom parameters with getTokenSilently, these custom options are now sent to both the authorize endpoint in the query string and the token endpoint in the request body (when not using refresh tokens), and to the token endpoint only, when using refresh tokens.

These custom parameters can then be picked up in a custom Rule.

This functionality appeared to work in when not using refresh tokens, as you could pass custom options and they would be sent, but only to the authorize endpoint.

References

Fixes #448

Testing

Added test coverage, also tested manually using the playground.

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[picosam]

Hello @stevehobbsdev -- I do appreciate your reactivity on this ticket, thank you!
Any idea when it will be released?

[stevehobbsdev]

Cutting the release now @picosam, expect it today at some point