[MLv2] [BE] Query display info

[ranquild]

Info about the query:

• native or not
• editable or not (MLv2 should be aware of this starting from drills). Should work for moth mbql and native queries.

Proposed signature:

displayInfo(query: Query): QueryDisplayInfo;

type QueryDisplayInfo = {
  isNative: boolean;
  isEditable: boolean;
};

Existing implementation for isEditable:

• MBQL queries

  metabase/frontend/src/metabase-lib/queries/StructuredQuery.ts

  Line 147 in 2928249

  isEditable(): boolean {

• Native

  metabase/frontend/src/metabase-lib/queries/NativeQuery.ts

  Line 162 in bb51edb

  isEditable(): boolean {