Promote resource_floats and resource_with_lists to runtime tests

[avrabe]

Part of #69, depends on #74

Task

Once per-component handle tables are implemented, promote the 3-component resource fixtures from fuse-only to runtime tests:

// Before:
fuse_only_test!(test_fuse_wit_bindgen_resource_floats, "resource_floats");
fuse_only_test!(test_fuse_wit_bindgen_resource_with_lists, "resource_with_lists");

// After:
runtime_test!(test_runtime_wit_bindgen_resource_floats, "resource_floats");
runtime_test!(test_runtime_wit_bindgen_resource_with_lists, "resource_with_lists");

Files: meld-core/tests/wit_bindgen_runtime.rs

If resource_with_lists fails with a different error, revert it to fuse_only_test and document.

Acceptance

cargo test --package meld-core passes with 74+ tests (73 existing + promoted).