add column vscode

[Jozef Slezak]

Goal: call addColumn() from vscode extension #105

lowcode/packages/react-lowcode/src/codegen/list.ts

Line 17 in f097fa6

 export async function addColumn(typesSourceCode: string,  

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Requirements

• extend vscode intellisense on material ui data grid - list available columns/fields in datagrid rows
• use above addColumn() to refeactore the code
• attach screenshots / video in the pr of the solution
• manual test on this project/file https://github.com/iteria-app/example-material-ui/blob/main/src/views/test/GeneratedCustomersTable.tsx