databases enhancements

[jhlzlove]

1. Customize the database driver file when adding data sources, which is very useful for some databases, especially domestic databases.
2. When generating or adding data sources to remove the specified prefix configuration , the current relative path item can be clicked to select the path without having to manually enter , which can greatly enhance the user experience .
3. The header of the generated class file can define author information and time of creation.

Finally, thank you very much for your contribution to the community! Greatness needs no introduction!