* [Refactor] Refactor Evaluator to Metric.

* update

* fix lint

* fix doc

* fix lint

* resolve comments

* resolve comments

* remove collect_device from evaluator

* rename

* [Enhancement] refactor base data elment

* fix comment

* fix comment

* fix pop not existing key without error

* [Refactor] Refactor interface of checkpointhook

* fix print format

* minor ifx

* [Refactor] Use mmengine distributed in evaluator

* remove 'TODO' comment

* update evaluator prefix

* update docstring and comments

* update doc

* update type hint and ut for evaluator

* update doc

* fix

* support metric prefix in BaseEvaluator

* update docs

* use class attribute default_prefix

* [Feature]: Add evaluator base class.

* solve comments

* update

* fix