feature/backing store

[baywet]

• adds backing store interface for dotnet abstractions
• adds the backing store parameter to kiota host
• adds IBackedModel interface to access the backing store during serilization and deserilization
• adds change filtering on backing store - adds change status update on backing store
• fixes a bug where store name was not being passed because of naming conventions
• adds the backing store property and maps other properties to it

fixes #81

Generation changes

microsoft/kiota-samples#85

TODO:

• Proxy pattern to flip the InitilizationCompleted and ReturnOnlyChangedValues for serialization/deserialization (object & object collections methods)
• generate default constructor for default property values when using backing store
• implementation for TypeScript
• implementation for Java
• getters & setters generation for TypeScript
• getters & setters generation for Java
• use readonly collections for collection properties?

[MIchaelMainer]

Reviewed at a high-level with Vincent via video conference.

global nit: add copyright and class documentation before finalizing PR. The code comments would've been useful during the review.

Do need documentation for backing store features. Backing store enables a lot. Capture the scenarios this enables in the documentation.

I didn't see a link to a design document. If one publicly exists, can you share? This is good stuff.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

87.8% Coverage
0.0% Duplication

[MIchaelMainer]

I appreciate this feature a lot.