Add #[inline] to forwarding methods of wasmparser::collections types

[Robbepop]

I applied #[inline] to all trivial methods of types in the wasmparser::collections submodule as stated here.

I ran benchmarks on main and the PR and built main and PR after a cargo clean to observe the performance impact of the changes on both compilation and execution. The tl;dr is that compile times are the same, and I only see minor improvements on execution.

Build times:

• main: 16.08s user 0.46s system 343% cpu 4.822 total
• PR: 16.04s user 0.46s system 348% cpu 4.736 total

Benchmarks: (PR run after main run)

Default Features

Features: no-hash-maps