feat: support customizing profile and accessToken routes

[eliw00d]

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

📋 Changes

• Update the RoutesOptions type definition
• Update the functions that consume these routes (getAccessToken, useUser) to respect the programmatically configured routes
• Update the documentation

📎 References

closes #2327

🎯 Testing

In an app that uses @auth0/nextjs-auth0, link to your local clone in the app's package.json as follows: "@auth0/nextjs-auth0": "file:path/to/nextjs-auth0", where path/to is your path to it.

I tested this with a local clone with an app that uses @auth0/nextjs-auth0 and everything works as expected.

[Piyush-85]

@eliw00d thanks for the contribution. Changes look good to be merged.
Could you please resolve the conflicts on this !
Will merge post that, thanks.

[eliw00d]

@Piyush-85 Absolutely! I'll get that up shortly.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.86%. Comparing base (c745513) to head (853e4df).

Files with missing lines	Patch %	Lines
src/client/index.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2451   +/-   ##
=======================================
  Coverage   89.85%   89.86%           
=======================================
  Files          68       68           
  Lines        8136     8140    +4     
  Branches     1744     1745    +1     
=======================================
+ Hits         7311     7315    +4     
  Misses        813      813           
  Partials       12       12           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.