Public properties : Fixes public types to be upgrade safe so new content is not lost on deserialize and serialize paths.

[sourabh1007]

Description

The current public types like ContainerProperties lose any new fields added by the service currently. If the property is not a know field is lost on the deserialize/serialize logic. This can possibly break older SDKs if new contract elements are added by the service and an update is attempted. The service might throw an exception thinking the user attempted to remove the new field when it was lost in the serialization logic.

To fix this issue a new internal dictionary is added to all the public service contract types to hold any additional properties the c# poco type is not aware of. So that in case of service contract evolution if metadata information changes, we won't loose any information.

Type of change

• [] Bug fix (non-breaking change which fixes an issue)

Closing issues

To automatically close an issue: closes #2678

[github-actions]

Please follow the required format: "[Internal] Category: (Adds|Fixes|Refactors|Removes) Description"

Internal should be used for PRs that have no customer impact. This flag is used to help generate the changelog to know which PRs should be included. Examples:
Diagnostics: Adds GetElapsedClientLatency to CosmosDiagnostics
PartitionKey: Fixes null reference when using default(PartitionKey)
[v4] Client Encryption: Refactors code to external project
[Internal] Query: Adds code generator for CosmosNumbers for easy additions in the future.

All good!

[kirankumarkolli]