springboot Fix of the issue #10886 Incremental compilation does not keep metadata...

Hi!

This PR fixes issue #10886 "Incremental compilation does not keep metadata for NestedConfigurationProperty".

Proposed changes make use type canonical name instead of class name to populate "sourceType" metadata.

Regards, Boris

Comment From: pivotal-issuemaster

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Comment From: borisfox73

I recall it as this change may break compatibility with already existing tools expecting class name in the sourceType property. Will supply back after redesign with an extra property for the canonical class name.