[test] Move basic tests in lit/ to lit/basic/ (WebAssembly#6156)

Here 'basic' tests means that what we have in `binaryen/test/`. We checked
three things with those tests:
- Run `wasm-opt -all -g` on it and compare the output with `*.from-wast`
- Run `wasm-as -all -g` and `wasm-dis` on it and compare the output with
  `*.fromBinary`.
- Run `wasm-as -all` and `wasm-dis` on it and compare the output with
  `*.fromBinary.noDebugInfo`.

I planned to move those to `test/lit/`. But `test/lit/` has other kind of
tests as well, so I think it'd be nice to have a dedicated directory for
these tests.

Before doing that, I noticed there are already four tests that have been
already ported to do this, and this PR moves them to `test/lit/basic/`.

I couldn't come up with a better name than `basic`. If you have other
suggestions please let me know.

Author: aheejin