Split db-specific Module traits into more specialized parts

[jczuchnowski]

This PR splits db-specific *Module traits into specialized parts with clear dependencies:

• *SqlModule - for db-specific DSL extensions
• *RenderModule - for the SQL rendering logic (depends on *SqlModule)
• *JdbcModule - final module for the end-user (combines *RenderModule with Jdbc)

Reasoning behind the change:

• db-specific Module traits became too large
• DSL should be separate from the rendering logic
• rendering logic and DSL should be separate from the driver implementation (JDBC)
• allows for different combinations of rendering logic implementations and drivers other than JDBC