lib: introduce struct library

Introduce a new "struct" library which is a port of the Python 3.10 struct
module with a reduced set of API functions. It supports the same format
patterns and conversions while providing the following methods:

    struct = require('struct');

    buf = struct.pack("fmt", args...);
    values = struct.unpack("fmt", buf);

    struct_inst = struct.new("fmt");
    buf = struct_inst.pack(args...);
    values = struct_inst.unpack(buf);

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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