Add test showing issue with reusing import objects w/ WasmerEnv

[MarkMcCaskey]

Run

cargo test --release --features "cranelift singlepass" --features "test-cranelift test-jit" -- multi_use_host_fn_manages_memory_correctly --nocapture

to reproduce the bug.

notice that the dbg! line is called twice, this means the env is being init'd twice, (it won't do anything the second time, so the second instance will see the wrong Memory)

This bug is being fixed in #1865

Review

• Add a short description of the the change to the CHANGELOG.md file

[MarkMcCaskey]

This was fixed and this test case added in #1865