feat: extract supported versions

switch to gopacket/gopacket!

feat: switch to gopacket/gopacket

Fix README links by adding https:// to GitHub repository URLs (#4)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Merge pull request #1 from coreyralph/alpn-length-check

Add length checks

merge dreadl0ck-gopacket branch, update imports back to google/gopacket

embed ServerHelloBasic in ServerHello

api cleanup and testing