Make kodr zero-dependency

[itzmeanjan]

• Implement $GF(2^8)$ arithmetic
• Remove dependency for galois field operations over $GF(2^8)$
• Bump to go version 1.24 and modernize with new language features
• Update benchmark results

[itzmeanjan]

Not using any external package for $GF(2^8)$ arithmetic makes RLNC encoder 12% faster, while reducing latency by 10%.