Home Key provisioning in Go

Home Key provisioning structures and operations are adapted from:
  kormax/apple-home-key-reader
  https://github.com/kormax/apple-home-key-reader
  Commit 96754078121cfe1792a1e2c402873d105c8016e3
  Apache License 2.0

Upstream credits include kormax (ECP/NFC protocol research), kupa22
(HAP and NFC protocol analysis), and the project's contributors.
Additional protocol documentation: https://github.com/kupa22/apple-homekey

Changes: Go implementation of provisioning only; bounded TLV8 parsing;
validated keys; atomic combined HAP/credential persistence; lifecycle cleanup;
standalone virtual lock; Go tests and Makefile. NFC authentication is omitted.

The bundled third_party/hap code is from github.com/brutella/hap v0.0.35,
commit bc03ca629d44dd58570c2979843f9f677818e31c. Original license and source
notices are retained. Locally modified files carry notices; the changes are
recorded in patches/hap.patch. Local regression tests are in
third_party/hap/homekey_patch_test.go. Generator, example and image assets
not needed for building the library were omitted.