Ext/sqlite3: SQLite3 :memory: exec/querySingle via libsqlite3 FFI (#3434)

[PurHur]

Summary

• Implement SQLite3 class on PHP_COMPILER_PROFILE=8.4 forward profile: __construct, exec(), querySingle(), close() (Stdlib: ext/sqlite3 — SQLite3 class connect/exec/query (ext/sqlite3 parity) #3434).
• PHP-in-PHP VM handlers in ext/sqlite3/ with thin VmSqlite3Native libsqlite3 FFI bridge (php-src ext/sqlite3/sqlite3.c).
• Register SQLite3 alongside existing SQLite3Exception hierarchy; spine + inventory refreshed.

php-src reference

• ext/sqlite3/sqlite3.c — PHP_METHOD(SQLite3, exec), querySingle, constructor/open
• ext/sqlite3/sqlite3.stub.php — method signatures, SQLITE3_* constants

Verification

PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_sqlite3_memory.php
# ok

PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/compliance/cases/ext/sqlite3_memory.phpt
# ok
# closed

./script/phpunit.sh --filter 'sqlite3_memory|sqlite3_exception_forward'
# OK (4 tests, 4 assertions)

Note: AOT user-script compile of the repro still hits VM-only class methods (Call to undefined method SQLite3::exec()); JIT/AOT lowering deferred to follow-up. VM parity is the issue done-when for v1.

Closes #3434

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