Support mknodat

[CvvT]

Support mknodat but only regular file is allowed. Others like char and block files return EPERM for now.

[github-actions]

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

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--- failure enum_no_repr_variant_discriminant_changed: enum variant had its discriminant change value ---

Description:
The enum's variant had its discriminant value change. This breaks downstream code that used its value via a numeric cast like `as isize`.
        ref: https://doc.rust-lang.org/reference/items/enumerations.html#assigning-discriminant-values
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.47.0/src/lints/enum_no_repr_variant_discriminant_changed.ron

Failed in:
  variant SyscallRequest::Unlinkat 57 -> 58 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2146
  variant SyscallRequest::Newfstatat 58 -> 59 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2152
  variant SyscallRequest::Eventfd2 59 -> 60 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2165
  variant SyscallRequest::Pipe2 60 -> 61 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2169
  variant SyscallRequest::Clone 61 -> 62 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2173
  variant SyscallRequest::Clone3 62 -> 63 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2176
  variant SyscallRequest::SetThreadArea 63 -> 64 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2181
  variant SyscallRequest::ClockGettime 64 -> 65 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2184
  variant SyscallRequest::ClockGetres 65 -> 66 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2188
  variant SyscallRequest::ClockNanosleep 66 -> 67 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2192
  variant SyscallRequest::Gettimeofday 67 -> 68 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2198
  variant SyscallRequest::Time 68 -> 69 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2202
  variant SyscallRequest::Getrlimit 69 -> 70 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2205
  variant SyscallRequest::Setrlimit 70 -> 71 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2209
  variant SyscallRequest::Prlimit 71 -> 72 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2213
  variant SyscallRequest::SetTidAddress 72 -> 73 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2224
  variant SyscallRequest::Gettid 73 -> 74 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2227
  variant SyscallRequest::SetRobustList 74 -> 75 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2228
  variant SyscallRequest::GetRobustList 75 -> 76 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2231
  variant SyscallRequest::GetRandom 76 -> 77 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2236
  variant SyscallRequest::Getpid 77 -> 78 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2241
  variant SyscallRequest::Getppid 78 -> 79 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2242
  variant SyscallRequest::Getuid 79 -> 80 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2243
  variant SyscallRequest::Geteuid 80 -> 81 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2244
  variant SyscallRequest::Getgid 81 -> 82 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2245
  variant SyscallRequest::Getegid 82 -> 83 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2246
  variant SyscallRequest::Sysinfo 83 -> 84 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2247
  variant SyscallRequest::CapGet 84 -> 85 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2250
  variant SyscallRequest::GetDirent64 85 -> 86 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2254
  variant SyscallRequest::SchedGetAffinity 86 -> 87 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2259
  variant SyscallRequest::SchedYield 87 -> 88 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2264
  variant SyscallRequest::Futex 88 -> 89 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2265
  variant SyscallRequest::Execve 89 -> 90 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2268
  variant SyscallRequest::Umask 90 -> 91 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2273
  variant SyscallRequest::Prctl 91 -> 92 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2276
  variant SyscallRequest::Alarm 92 -> 93 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2279
  variant SyscallRequest::SetITimer 93 -> 94 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:2282