Using "mimalloc" - general purpose memory allocator - in nBallerina runtime

[sameerajayasoma]

I came across this project today. Microsoft maintains it (https://github.com/microsoft/mimalloc). Kotlin/Native uses this library in their runtime implementation.

There is also Rust bindings to the C implementation of mimalloc.

https://crates.io/crates/mimalloc

Shall we check whether this is a good fit for nBallerina runtime implementation? @ayonam @uthaiyashankar @manuranga