feat: add config.options.indent_str to rice indent string

[xero]

adds config.options.indent_str allowing for customized indents

[xero]

indent_str = " ┊ ",

[folke]

Development on the main branch is EOL.

Trouble has been rewritten and will be merged in main soon.

This issue/feature either no longer exists or has been implemented on dev.

For more info, see https://github.com/folke/trouble.nvim/tree/dev