feat: align varchar columns left & yarn 4 migration

[bluestreak01]

This PR fixes incorrect alignment of VARCHAR columns in the grid.

Additionally, it migrates the build system to node 20+ and yarn 4 as the current node 16 requirement is severely out of date. If you are still on node 16 you can upgrade yourself and start the web console using these commands:

npm install --global yarn 
yarn set version latest
yarn install
yarn workspace @questdb/web-console start

Proof of manual testing:

Before

After