Driver Adaptation to `To-be-Closed` variables and Enhancement of Test Suite

[ChaitanyaD48]

Summary

This pull request addresses the Adaptation of LuaSQL drivers to to-be-closed variables introduced in Lua 5.4

Proposed Changes

• Added __close metamethod to cursor, connection and environment objects of drivers to make them compatible to to-be-closed variation of objects
• Added Test Suite to test to-be-closed support of LuaSQL Drivers
• Added Correction on compilation messages