Add analyzer to warn user about wrong method resolution

[StefanOssendorf]

Due to the way the Compiler works and resolves methods some names do not work for the generation.
E.g

• Fetch
• FetchAsync
• and all other method names defined by IDataPortal

To inform the user about that behavior a new diagnostic should be reported when the user has defined a method name (Prefix+Method name+Suffix) which is defined by IDataPortal.