[x/programs] why we use the default Rust allocator vs wee_alloc

[hexfusion]

In many references to memory allocation in Wasm including the Rust book[1] claim that switching to wee_alloc is the best path forward. I did a deep dive here and found that to not be true.

Cons of wee_alloc

• Latest release is 4 years+ old [4]
• Unmaintained [2]
• Memory leaks [3]

The general guidance is to use the default allocator. This issue is a historical reference to folks who will ask the question in the future.

[1] https://rustwasm.github.io/docs/book/reference/code-size.html?highlight=wee#avoid-allocation-or-switch-to-wee_alloc
[2] rustwasm/wee_alloc#107
[3] rustwasm/wee_alloc#106
[4] https://crates.io/crates/wee_alloc/versions