ext/sodium: ChaCha20 stream, XChaCha20 stream, and AEAD APIs (#15464, #15461, #15429)

[PurHur]

Summary

• Register ChaCha20 stream API: sodium_crypto_stream(), sodium_crypto_stream_xor(), sodium_crypto_stream_keygen() (Stdlib: sodium_crypto_stream()/stream_xor()/stream_keygen() missing — ChaCha20 stream API (ext/sodium/libsodium.c) #15464)
• Register XChaCha20 stream API: sodium_crypto_stream_xchacha20*() including xor_ic and keygen (Stdlib: sodium_crypto_stream_xchacha20* missing — XChaCha20 stream/XOR API (ext/sodium/libsodium.c) #15461)
• Register XChaCha20-Poly1305 AEAD: sodium_crypto_aead_xchacha20poly1305_ietf_encrypt() / _decrypt() (Stdlib: sodium_crypto_aead_xchacha20poly1305_ietf_* missing — XChaCha20-Poly1305 AEAD (ext/sodium/libsodium.c) #15429)
• PHP-in-PHP implementation in ext/sodium/ via VmSodium (host sodium_* or libsodium FFI); JIT lowering for stream XOR helpers via SodiumJitHelper

php-src reference

• ext/sodium/libsodium.c — PHP_FUNCTION(sodium_crypto_stream*), sodium_crypto_stream_xchacha20*, sodium_crypto_aead_xchacha20poly1305_ietf_*

Verification

php bin/vm.php test/repro-maintainer/maintainer_gap_sodium_crypto_stream.php
# stream_ok

php bin/vm.php test/repro-maintainer/maintainer_gap_sodium_crypto_stream_xchacha20.php
# xchacha20_stream_ok

php bin/vm.php test/repro/maintainer_gap_sodium_xchacha20_aead.php
# aead_ok

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter sodium_crypto_stream'
# OK (4 tests)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter sodium_xchacha20_aead'
# OK (2 tests)

Closes #15464
Closes #15461
Closes #15429

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