Solidity-lite

Many thanks to Juanfranblanco for the vscode extension https://github.com/juanfranblanco/vscode-solidity.

This is the lite version of the solidity extension, created mainly for personal use. It removed the following unnecessary functionalities.

• It cleared the context menu. The orginal solidity extension has taken too much in the context menu.
• It removed the contract compilation function. We all have tools like truffle or hardhat for compiling contracts. No need to keep this part.
• It removed the code generation.