Adds ability to disable pre/post-processing for examples (#2383)
* fixing examples
* adding parameters
* postprocess
* examples
* added tests
* changelog
* Update CHANGELOG.md
* added docstrings
* Adds ability to provide a `gr.update()` dictionary even if `postprocess=False` (#2385)
* docs
* fixes
* added docs, fixed test
* changelog
* fix suggestoins
* formatting
* fix tests
* fix tests
