Add more wawaka memory stress tests

[masomel]

Wawaka is WebAssembly-based smart contract interpreter based on WAMR. To ensure that the interpreter appropriately handles memory allocations the contracts it executes, we have implemented a number of memory stress tests. However, current memory stress tests for wawaka only stress the interpreter's heap.

See WAMR's memory tuning docs for more info on WAMR's memory internals.

We need to add tests that stress the other types of allocations:

• global vector that is larger than the heap
• local buffer that is larger than the heap
• stack allocations