Move Saved Object Management into a separate Plugin.

• Allow plugins to configure the values in
  SavedObjectsManagementTypeDefinition for each of their Saved Object types.

  interface SavedObjectsManagementTypeDefinition {
    isImportableAndExportable?: boolean;
    defaultSearchField?: string;
    icon?: string;
    getTitle?: (savedObject: SavedObject) => string;
    getEditUrl?: (savedObject: SavedObject) => string;
    getInAppUrl?: (savedObject: SavedObject) => { path: string; uiCapabilitiesPath: string };
  }

• Move legacy UI to new plugin src/legacy/core_plugins/kibana/public/management/sections/objects
• Move legacy routes to new plugin src/legacy/core_plugins/kibana/server/routes/api/management/saved_objects
• Don't convert deprecated JSON import code to typescript since we will be removing the JSON import UI and routes (src/legacy/core_plugins/kibana/server/routes/api/{import/export}) in 8.0.0 see Remove Dashboard Import/Export API #41439

Progress

• allow to register management section for SO types from NP API: Add SavedObject management section registration in core  #59291
• migrate the object edition view to react: migrate saved objects management edition view to react/typescript/eui #59490
• migrate the server-side part of the management section to NP plugin: Migrate SO management routes to new plugin #59734
• migrate the client-side action registry to NP plugin: Migrate savedObjectManagementActionRegistry to NP plugin #60481
• migrate the rest of the client-side part of the management section to NP plugin: Migrate SO management section to NP #61700