Define custom ruleset

I like this plugin but it would be cool if you could define some rules.
Currently it's formatting toml files like this:

[database]

[database.options]
type = "mongodb"

[database.con]
server = "localhost"
port = 1337

It would be cool if you have a setting to format it like this:

[database]

[database.options]
type = "mongodb"

[database.con]
server = "localhost"
port = 1337

So it uses tabs.

Start by locating the TypeScript formatter entry point and any existing configuration or formatting tests. Use the TOML examples as the expected behavior: a setting should allow nested tables and their contents to use the requested tab indentation, with tests covering the shown output.

Written by the indexing model from the issue text.