pkg/ifaceprobe: add package

Package ifaceprobe implements dynamic component of automatic kernel interface extraction.
Currently it discovers all /{dev,sys,proc} files, and collects coverage for open/read/write/mmap/ioctl
syscalls on these files. Later this allows to build file path <-> file_operations mapping.

I've tried 2 other approaches:
1. Immediately map file to file_operations callbacks similar to tools/fops_probe,
   and export only that. This required lots of hardcoding of kernel function/file
   names, did not work well in all cases, and presumably would produce more
   maintanance in future.
2. Automatically infer what kernel functions are common, and which correspond
   to file_operations callbacks by first collecting coverage for all files/programs,
   and then counting how many times wach PC is encountered in combined coverage.
   Presumably common functions (SYS_read, vfs_read) will be present in most/all traces,
   while the actual file_operations callback will be present in only one/few traces.
   This also did not work well and produced lots of bugs where common functions
   were somehow called in few programs, or common file_operations callbacks were
   called in too many traces.

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