[LSP] Add support for range formatting

[ndavd]

trafficstars

The lack of range formatting capabilities make the LSP incompatible with several formatting tools such as https://github.com/stevearc/conform.nvim. It would be nice if it could be added since no formatter is complete without supporting range formatting ❤️

[kanej]

Agreed. We use prettier to power our formatting. I will need to investigate whether prettier + the prettier solidity extension provide range formatting.