* Datasource: updates PromExploreQueryEditor - rewrite to functional component

* Datasource: updates PromQueryField - moves an extra field from children to the separate prop

* Datasource: adds PromExploreExtraField

* Datasource: updates PromExploreQueryEditor - fixes typo

* Datasource: updates prometheus explore editor snapshots

* Datasource: updates PromExploreExtraField export

* Datasource: removes unnecessary div from PromExploreQueryEditor

* Datasource: adds basic PromExploreExtraField snapshot test

* Datasource: adds basic PromExploreQueryEditor test

* Datasource: updates PromExploreQueryEditor snapshot to fix timezone issues

* Datasource: updates PromExploreQueryEditor - onChangeQueryStep cleanup

* Datasource: updates PromExploreQueryEditor test to check ExtraFieldElement render

* Datasource: simplified PromExploreQueryEditor onStepChange method

* Datasource: updates Prometheus module import

* Datasource: updates PromExploreQueryEditor test

* Datasource: updates PromExploreQueryEditor tests

* Datasource: fixes PromExploreQueryEditor error on empty interval init

* Datasource: adds a tooltip to PromExploreExtraField mounted in PromExploreQueryEditor

* Datasource: updates PromExploreQueryEditor snapshots