fix: support runtime tenant/domain switching

[subhankarmaiti]

Summary

Fixes switching between Auth0 tenants (domain/clientId) at runtime. Previously,
changing the domain or clientId did not take effect — calls kept targeting the
original tenant.

• Dynamically swapping clientId or domain during runtime isn't working #1520: Updating domain/clientId on Auth0Provider now correctly switches
  the active tenant.
• webAuth() uses the previously-active tenant's authorize URL #1523: Using multiple Auth0 clients (or reusing one after switching) now
  routes each call to the right tenant.

JS-only fix — no native iOS/Android changes required. Works on bare React Native
and Expo.

Notes

• Switching tenants does not instantly clear the displayed user; the provider
  re-initializes for the new tenant and updates user once that completes.
  Credentials are stored per tenant, so an already-logged-in user is restored.
• You still need to register each tenant's callback at build time (manifest /
  Info.plist / Expo plugin). See the new "Switching tenants at runtime" section
  in EXAMPLES.md.

Test plan

• Switch tenant at runtime and confirm authorize() opens the newly selected
  tenant's login and the redirect resolves.

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