Improve debugging with dlv dap (in VSCode, for example)

[norio-nomura]

- hack/toolexec-for-codesign.sh: add a wrapper script for -toolexec to codesign an executable produced by linker

By passing -toolexec hack/toolexec-for-codesign.sh to the Go build options, the executable will be codesigned with vz.entitlements after linking. This eliminates the need to prepare a pre-signed debug binary when running dlv dap (in VSCode, for example) for debugging.
usage in launch.json:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Debug limactl hostagent for debug instance",
            "type": "go",
            "request": "launch",
            "mode": "debug",
            "program": "${workspaceFolder}/cmd/limactl",
            "buildFlags": [
                "-toolexec",
                "${workspaceFolder}/hack/toolexec-for-codesign.sh",
            ],
            "env": {
                "CGO_ENABLED": "1"
            },
            "cwd": "${userHome}/.lima/debug",
            "args": [
                "hostagent",
                "--pidfile",
                "ha.pid",
                "--socket",
                "ha.sock",
                "debug"
            ],
            "preLaunchTask": "prepare launching hostagent for debug instance",
            "postDebugTask": "clean up after stopping hostagent for debug instance"
        },
    ]
}

- pkg/usrlocalsharelima: add a candidate directory to searching lima-guestagent

When debugging cmd/limactl with dlv dap, the executable appears as follows:
cmd/limactl/__debug_bin2611107549.
In this case, limactl fails to locate lima-guestagent relative to the expected executable path and results in the following error:

{
  "level": "fatal",
  "msg": "failed to find \"lima-guestagent.Linux-aarch64\" binary for \"/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/__debug_bin2611107549\", attempted [/Users/norio/ghq/github.com/lima-vm/lima/cmd/limactl/lima-guestagent.Linux-aarch64 /Users/norio/ghq/github.com/lima-vm/lima/cmd/share/lima/lima-guestagent.Linux-aarch64]",
  "time": "2024-09-24T15:02:23+09:00"
}

To avoid this error, it was necessary to create a symbolic link (ln -sf ../_output/share cmd/share) so that lima-guestagent* exists at the expected relative path.
This change adds _output/share/lima/lima-guestagent.* to the search directories, making the symbolic link creation unnecessary before running dlv dap for debugging.

[AkihiroSuda]

Thanks

[norio-nomura]

Thanks! 🙏🏻