Fix for TS create declarations when updating (v6)

[steffenagger]

Main goal

Initiated based on this comment: #3044 (comment) - v10 PR can be found here: #3266.

Allow for partial models when using Realm.UpdateMode.All or Realm.UpdateMode.Modified

create<T> declarations has been updated to:

/** ... */
create<T>(type: string, properties: RealmInsertionModel<T>, mode?: Realm.UpdateMode.Never): T & Realm.Object;
create<T>(type: string, properties: Partial<T> | Partial<RealmInsertionModel<T>>, mode: Realm.UpdateMode.All | Realm.UpdateMode.Modified): T & Realm.Object;

/** ... */
create<T extends Realm.Object>(type: {new(...arg: any[]): T; }, properties: RealmInsertionModel<T>, mode?: Realm.UpdateMode.Never): T;
create<T extends Realm.Object>(type: {new(...arg: any[]): T; }, properties: Partial<T> | Partial<RealmInsertionModel<T>>, mode: Realm.UpdateMode.All | Realm.UpdateMode.Modified): T;

Additional changes

objectForPrimaryKey<T> updated to:

 /** ... */
objectForPrimaryKey<T>(type: string, key: number | string): (T & Realm.Object) | undefined;

/** ... */
objectForPrimaryKey<T extends Realm.Object>(type: {new(...arg: any[]): T; }, key: number | string): T | undefined;

The above change limits the use of realm.objectForPrimaryKey(Person) to only accept Class Model which extends Realm.Object (just like objects<T>(...) is currently declared).

I extended integration-tests for object creation/reading to include update-tests, a objectForPrimaryKey test & include Class Models in testing (these additions only works in combination with the merged #3261).

And fixed an issue with serialization tests (so it now works in different environments - the previous error message check was a bit too specific, as described here (MDN)).

☑️ ToDos

• 📝 Changelog entry
• 🚦 Tests

If this PR adds or changes public API's:

• typescript definitions file is updated
• jsdoc files updated
• Chrome debug API is updated if API is available on React Native

[kraenhansen]

Looking good :)