Improve `Vec2`

The following tasks are for Vec, I intend to work on them in order.

• Speed up push by adding a grow_one method, like https://doc.rust-lang.org/src/alloc/raw_vec.rs.html#338-343 oxc-project/oxc#9855 oxc-project/oxc#9856
• Align initialize size of amortized strategy with standard implementation oxc-project/oxc#9857
• Clean up duplicate function/method by calling the standard library exposed https://github.com/oxc-project/oxc/pull/9860
• Rename used_cap and needed_extra_cap params names to len and additional` to make it like the same as the standard implementation does oxc-project/oxc#9858
• Improve methods according to the standard implementation one by one oxc-project/oxc#9752
• Remove ZSTs support
• Merge RawVec into Vec2 and change len and cap to u32 oxc-project/oxc#10883
• Change len and cap fields from usize to u32 oxc-project/oxc#10884
• Removing #[expect(...)] attr (not decide when to start, but it probably starts when all methods implementation has aligned with std)
• Add &Arena instead of &bump https://github.com/oxc-project/backlog/issues/199#issuecomment-3765255495
• Remove Vec::try_ methods.
• Merge Vec and Vec2 into one