ihdad: Implement fstat

Fixes the output of sys:/iostat.
The correct implementation is TODO like most of the scheme related code in this driver.
7 jobs for ihdad-fpath in 46 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #6577
build

00:00:46

 
  Test
skipped #6579
allowed to fail
code_quality
skipped #6583
allowed to fail
container_scanning
skipped #6582
allowed to fail
dependency_scanning
skipped #6580
allowed to fail
license_management
skipped #6581
allowed to fail
sast
skipped #6578
test
 
Name Stage Failure
failed
build Build
Checking out 5c3b676a as ihdad-fpath...
Skipping Git submodules setup
$ # Auto DevOps variables and functions # collapsed multi-line command
$ setup_docker
$ build
Logging to GitLab Container Registry with CI credentials...
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Get https://registry-1.docker.io/v2/: unauthorized: incorrect username or password
ERROR: Job failed: exit code 1