* feat(op): Add response_mode: form_post
* Fix to parse the template ahead of time
* Fix to render the template in a buffer
* Remove unnecessary import
* Fix test
* Fix example client setting
* Make sure the client not to reuse the content of the response
* Fix error handling
* Add the response_mode param
* Allow implicit flow in the example app
* feat(rp): allow form_post in code exchange callback handler
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Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>
