Impl rewrite_result for ast nodes in types.rs

[ding-young]

Tracked by #6206

Description

• SegmentParam
• PreciseCapturingArg - will work on further pr for refactoring rewrite_path
• ast::AssocConstraint - will work on further pr with rewrite_generic_args
• ast::AssocConstraintKind
• ast::WherePredicate - will work on further pr with rewrite_assign_rhs
• ast::GenericArg
• ast::AnonConst - directly calls format_expr, so better delay until almost every ast node that corresponds to ExprKind has rewrite_result implementation
• ast::Lifetime - does it worth replacing at this point? it just wraps String with Some
• ast::GenericBound
• ast::GenericBounds
• ast::GenericParam
• ast::PolyTraitRef - will work with TraitRef
• ast::TraitRef - calls rewrite_path. will work on further pr for refactoring rewrite_path
• ast:Ty

[ytmimi]

Overall the code changes seem very straightforward to me. I just left one nit pick, but I'm also fine leaving the code as is