perf(es/ast): Use smallvec and reduce size if possible

[kdy1]

Description:

Related issue:

• Closes es/ast: Box<Expr> can use SmallVec for free #10001
• Closes es/ast: ExprOrSpead#spread can be Option<BytePos> #10002
• Example of update for Wasm plugin authors: build: Adjust code to match SmallVec optimization in core plugins#412
• Example of update for custom SWC binary: build: Adjust code for SmallVec optimization  vercel/next.js#76104

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[kdy1]

Numbers for RSS of the SWC minifier as standalone:

main:

   process: user: 5.075 s, system: 1.249 s, faults: 2, rss: 277.2 MiB, commit: 1.9 GiB

With small vector optimization:

   process: user: 4.944 s, system: 1.193 s, faults: 0, rss: 267.2 MiB, commit: 2.0 GiB

The gain is only 10MB, so I think this optimization does not worth the effort