Run lind-wasm with Enarx in SGX

[Yaxuan-w]

• fork / pthread works
• write / printf interacts with terminal successfully
• lack access to local FS
  • need to preload by Enarx.toml?
• exec not working (maybe same reason as local FS)

Need coupled with modifications in lind-wasm codebase (branch run-with-enarx) to work.

[Yaxuan-w]

• Changed FS_ROOT in wasmtime and rawposix to gain access
• Enarx.toml usage seems not working now
• execv works by passing the wasm binary

Still need to work on passing the arguments since I removed dependencies of CLI.

[Yaxuan-w]

• Handled args by enabling Enarx.toml usage