Allow backing store serialization configuration in serialization helpers

[Ndiritu]

closes #1131

Allows overriding default backing store behaviour while serializing.

• Retains previous serialization helper method implementation with the default behaviour of returning only changed values (true). To prevent backward incompatibility.

Usage

Before:

// BackedModel model = kiotaClient...get();
String result = KiotaJsonSerialization.serializeAsString(model); // returns empty string since no property has changed.

Now:

// User model = kiotaClient...get();
String result = KiotaJsonSerialization.serializeAsString(model, false); // returns serialized string by disabling returnOnlyChangedValues

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
80.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[baywet]

Thank you for making the changes!