Auto merge of #98188 - mystor:fast_group_punct, r=eddyb

proc_macro/bridge: stop using a remote object handle for proc_macro Punct and Group

This is the third part of rust-lang/rust#86822, split off as requested in rust-lang/rust#86822 (review). This patch transforms the `Punct` and `Group` types into structs serialized over IPC rather than handles, making them more efficient to create and manipulate from within proc-macros.

Author: bors