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Refactoring to use the builder for the database fields instad of the constructor

Removed all usages of the String constructor of DatabaseTableIndex and replaced it with builder use

Removed all usages of the default constructor of DatabaseTableIndex and replaced it with builder use

Refactoring after the renaming of the constant classes. This conclude #91

Rename the class

Refactered the constant interfaces into final classes

Added parsing of oracle inner forign key constraint

Widen the visibility of the parseField method so it can be overriden. Implement the parsing of primary key of oracle tables. This concludes #42.

Added keyword primary

Updated the version number