Stylises the code declared with a multiverse object according to the tidyverse style guide.
Details
Since multiverse captures unevaluated expressions, the formatting is not preserved. However, if we want to view the code that is delcared for a particular multiverse analysis, the lack of formatting would lead to difficulty in readability. `style_multiverse_code` is primarily intended for internal use to stylise the output based on the tidyverse style guide and custom rules necessary for multiverse.