Add let_chain_style configuration option
#5983
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Now users have some control over how `let-chains` are formatted. The default value of `LegibleBindings` follows the style guide prescription defined in `r-l/rust 110568`. The `Tall` variant provides users an option to format all chain items on a single line if they fit.
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This is a follow up to #5910, which added support for
let-chains.Now users have some control over how
let-chainsare formatted. The default value ofLegibleBindingsfollows the style guide prescription defined in r-l/rust#110568. TheTallvariant provides users an option to format all chain items on a single line if they fit.Happy to bike shed on the variant names, but I wanted to get the ball rolling on the new configuration.
r? @calebcartwright