Creating interfaces and generics

- Improve interaction/checks in dialog
- Add local store of created delta ensembles
- Add utils for array of various EnsembleIdentInterface implementaitons
- Improve functionalityof ensemble select dialog

WIP

Split code into two utils: One for fetching from back-end and another to assemble Ensemble and DeltaEnsemble objects to create new EnsembleSet

… to "Array" and more

EnsembleSet:
- Split override functions into separate function, and remove EnsembleType enum
- Rename original getEnsembleArr() to getEnsembleArray()

General:
- Rename namings from "Arr" to "Array"
- Move getEnsembleIdentFromString() from ensembleIdentUtils.ts to internal util for realizationFilterSettings
- Remove unused hook useFirstEnsembleInEnsembleSet in WorkbenchSession.ts

From "First Ensemble" and "Second Ensemble"  to "Compare Ensemble" and "Reference Ensemble"

Fix comments, minor bug fixes and adjust code

Adjust back-end after discussion with Sigurd

- Remove EnsembleInterface and EnsembleIdentInterface
- Rename `Ensemble` to `RegularEnsemble`and `EnsembleIdent` to `RegularEnsembleIdent`

Handle/prevent duplicated delta ensembles in dialog

- Add unit tests
- Remove isEqual func

Adjust incorrect order of RegularEnsemble arguments resulting in failing tests.

Minor fixes/adjustments based on observations during "EnsembleIdent->string"-spike

…simulation-time-series

…simulation-time-series

…ctions

Based on discussion: Remove overload, and explicitly implement fixup based on argument types. As the overloads had a bug, where currIdent could be of a type, and if the type does not exist in ensembleSet, an incorrect ident would be returned for a module not supporting it.

E.g. request RegularEnsembleIdent, ensemble set removes last RegularEnsembleIdent, then DeltaEnsembleIdent is returned, and the module might get error scenario.