feat(js): run experiment (#5755)

* feat(js): run experiment

* Scaffold more fns to support runExperiment

* Refactor experiment runs

* Run tasks concurrently

* Implement evaluation runner

* Symlink phoenix/app prettier config into phoenix/js to prevent conflicts with pre-commit and ide integrations

* Add experiment example to phoenix_client

* fix debug id fn

* Simplify example and include evaluator

* Improve logging

* Update experiment evaluator param type, test autoevals

* Improve example code logging

* remove relative import paths

* Move sample application to new examples/apps repo dir

* Improve documentation for phoenix-experiment-runner sample app

* Implement logger interface

* make experiment name optional

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Co-authored-by: Tony Powell <apowell@arize.com>