chore(ffi): generate lsquic bindings with nodeclguards

[richard-ramos]

Summary

Regenerates the lsquic FFI bindings with -d:nodeclguards for increased readability. Also updates CI targets so they match nim-libp2p (Using nim2.0 would trigger errors with these changes)

The manual enum and CID definitions are moved into lsquic/lsquic_ffi_types.nim so both the generator and final prelude compile against the same definitions. The generator filters symbols supplied by that shared file and rewrites aliases that should resolve to already-known Nim types, including manual enums, BoringSSL structs, and SockAddr.

Affected Areas

• Build / Tooling
  • Updates the Futhark generation flags and removes generated-file SockAddr post-processing from build.sh.
• Other
  • Adds shared FFI type definitions included by both prelude.nim and generate_lsquic_ffi.nim.
  • Regenerates lsquic/lsquic_ffi.nim without Futhark declaration guards.

References

• https://github.com/PMunch/futhark#compatibility-features-and-readability

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