feat: add PKCE support for OAuth2 Authorization Code flows (#5361)
* Add PKCE support.
* Fix tests
* Update oauth2.md
* Rename usePkce
* Fix the BrokenComponent error
* Update oauth2.md
* Remove isCode variable. Remove uuid4 dependency.
* Remove utils functions
* Import crypto
* Fix tests
* Fix the tests
* Cleanup
* Fix code_challenge generation
* Move code challenge and verifier to utils for mocks. Update tests.
* Mock the PKCE methods in the utils file properly.
* Add missing expect
* use target-method spies
* Add comments to explain test values.
* Get rid of jsrsasign.
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