There's a cyclic dependency on siderolink library which imports talos
machinery back. We will fix that after we get talos pushed under a new
name.
Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>
Fixes#4688
Instead of using generic library, build some handcrafted code to
reuse buffers, do partial parsing of the data we need for the processes
API.
Benchmark (it runs with significant number of processes on the host):
```
name time/op
PrometheusProcfs-16 3.42ms ± 8%
Processes-16 2.36ms ± 5%
name alloc/op
PrometheusProcfs-16 366kB ± 0%
Processes-16 255kB ± 0%
name allocs/op
PrometheusProcfs-16 6.76k ± 0%
Processes-16 3.83k ± 0%
```
Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>
