feat(traces): evaluation annotations on traces for associating spans with eval metrics (#1693)

* feat: initial associations of evaluations to traces

* add some documentaiton

* wip: add dataframe utils

* Switch to a single evaluation per dataframe

* make copy the default

* fix doc string

* fix name

* fix notebook

* Add immutability

* remove value from being required

* fix tutorials formatting

* make type a string to see if it fixes tests

* fix test to handle un-parsable

* Update src/phoenix/trace/trace_eval_dataset.py

Co-authored-by: Xander Song <axiomofjoy@gmail.com>

* Update src/phoenix/trace/trace_eval_dataset.py

Co-authored-by: Xander Song <axiomofjoy@gmail.com>

* change to trace_evaluations

* cleanup

* Fix formatting

* pr comments

* cleanup notebook

* make sure columns are dropped

* remove unused test

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Co-authored-by: Xander Song <axiomofjoy@gmail.com>