Stdlib: ext/sqlsrv — sqlsrv_connect()/sqlsrv_query() SQL Server driver (#6577)

[PurHur]

Summary

• Add ext/sqlsrv/ with phase-1 procedural builtins: sqlsrv_connect, sqlsrv_close, sqlsrv_query, sqlsrv_fetch_array, sqlsrv_errors.
• function_exists('sqlsrv_*') is true; invalid connect returns false and populates structured sqlsrv_errors() (IMSSP/-49) when the Microsoft ODBC driver is absent — matches php-src ext/sqlsrv enterprise probe pattern.
• Register module in ExtensionRegistry (83 extensions) and capability matrix (+5 builtins → 1172).

php-src reference

• ext/sqlsrv/php_sqlsrv.c — module init / function registration
• ext/sqlsrv/shared/core_conn.cpp — connect + error propagation

Verification

./script/aot-smoke.sh
# aot-smoke: 8 passed, 0 failed

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php -r "
foreach ([\"sqlsrv_connect\",\"sqlsrv_query\",\"sqlsrv_fetch_array\",\"sqlsrv_errors\",\"sqlsrv_close\"] as \$fn) {
    echo \$fn, \"=\", var_export(function_exists(\$fn), true), \"\\n\";
}
\$conn = sqlsrv_connect(\"localhost\", [\"Database\" => \"test\", \"UID\" => \"sa\", \"PWD\" => \"x\"]);
echo \"connect=\", var_export(\$conn, true), \"\\n\";
\$errors = sqlsrv_errors();
echo \"sqlstate=\", \$errors[0][\"SQLSTATE\"], \" code=\", \$errors[0][\"code\"], \"\\n\";
"'
# sqlsrv_connect=true … sqlsrv_close=true
# connect=false
# sqlstate=IMSSP code=-49

php script/generate-extension-registry.php --check
# ok — 83 extensions

php script/capability-matrix.php --check
# ok (after regen committed)

Note: VMTest data provider currently errors on an unrelated PHPT EXTENSIONS section on master; repro verified via bin/vm.php inline above and committed test/compliance/cases/stdlib/sqlsrv_functions_exist.phpt.

Closes #6577

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