Add adapter for jco

[wingo]

This PR adds support for jco. However, nothing passes yet:

• jco run needs --env and --dir argument support
• jco doesn't yet support some of the component model (lowering async imports, i think)
• jco only does wasip2 and wasip3 IIUC

Sample run:

~/src/wasip3/wasi-testsuite$ JCO="npx --prefix=../jco jco" ./run-tests -r adapters/jco.py 
Running test suite WASI C tests [wasm32-wasip1] with jco 1.15.0
______________

Running test suite WASI Rust tests [wasm32-wasip3] with jco 1.15.0
!!!!!!!!!!!!!!!!!!!
Running test suite WASI Rust tests [wasm32-wasip1] with jco 1.15.0
______________________________________________
Running test suite WASI Assemblyscript  tests [wasm32-wasip1] with jco 1.15.0
____________
===== Test results =====
jco 1.15.0: FAIL: 19/19 tests failed (72 skipped)
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-mkdir-rmdir.wasm
  npx --prefix=../jco jco run tests/rust/testsuite/wasm32-wasip3/http-fields.wasm
  npx --prefix=../jco jco run tests/rust/testsuite/wasm32-wasip3/test-stat-at-root.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-stat.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-read-directory.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-io.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-is-same-object.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-symbolic-links.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-rename.wasm
  npx --prefix=../jco jco run tests/rust/testsuite/wasm32-wasip3/monotonic-clock.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-open-errors.wasm
  npx --prefix=../jco jco run tests/rust/testsuite/wasm32-wasip3/multi-clock-wait.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-metadata-hash.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-unlink-errors.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-flags-and-type.wasm
  npx --prefix=../jco jco run tests/rust/testsuite/wasm32-wasip3/wall-clock.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-hard-links.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-advise.wasm
  npx --prefix=../jco jco run --dir tests/rust/testsuite/wasm32-wasip3/fs-tests.dir::fs-tests.dir tests/rust/testsuite/wasm32-wasip3/filesystem-set-size.wasm

Cc @vados-cosmonic.