Fix GH-17068: Add pack()/unpack() format for signed integer endianness #19368
+524
−10
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Fix #17068
Adds signed integer endianness support to pack()/unpack() functions. There are 2 new format codes (from the original issue): m/y for signed 2-byte (little/big endian), M/Y for signed 4-byte (little/big endian), and p/j for signed 8-byte (little/big endian). It follows the existing pattern where lowercase matches uppercase endianness.
I also moved pack tests in a dedicated folder.