Revisit EntityState behaviour with CRUD operations

[jordimontana82]

It seems EntityState is ignored when performing CRUD operations.

Review permutations of CRUD operations and the different entity states:

• EntityState: null (should perform the default operation) ?
• EntityState : Changed (should update) ?
• EntityState: Created (should create) ?
• EntityState: Unchanged (should ignore changes) ?

More info at: jordimontana82/fake-xrm-easy#255

[khoait]

hi @jordimontana82, we're heavily using OrganizationServiceContext to perform create/update on related records in relationships in plugins. currently the library is always creating new related records causing There is already a record of entity xxx with id 8c170298-xxxx-xxxx-xxxx-0022489a2fb3, can't create with this Id. So we need to ignore affected tests for now.

Adding this feature will bring the faked context closely aligned with the runtime context making testing more efficient and reliable.

Thanks for the amazing library!