Id should be generated from storage or should be generated from code-base

[Adem Catamak]

https://github.com/phatboyg/NewId

Currently, id generation operation is executed in data-storage. On the other hand, id could be created from code-base and db forced to save an entity with the given id. (below repo is an example of generating id)

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• If code would generate id value, there will be no need to SetId methods for Message and Jobs
• If code would generate id value, the project could get rid of the dependency that db incremental id features

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• If code generates id value, id value's type cannot be long. This situation's effect on query performance should be examined.

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[Adem Catamak]

#34