Gate curl_escape/curl_unescape on extension_loaded('curl') (#13588)

[PurHur]

Summary

• Add CurlExtensionPolicy::advertisesBuiltins() mirroring IntlExtensionPolicy — withhold curl_escape() / curl_unescape() from function_exists() until extension_loaded('curl') is true (Stdlib: ext/curl — curl_init/exec/getinfo and HTTP client API (ext/curl parity) #3325 client).
• php-src reference: ext/curl/interface.c — PHP_FUNCTION(curl_escape) requires CurlHandle.
• PHP implementation: ext/curl/CurlExtensionPolicy.php, ext/curl/Module.php.

Closes #13588

Verification

php bin/vm.php test/repro/maintainer_gap_curl_escape_phantom_signature.php
# ok

php bin/vm.php -r "echo (int)function_exists('curl_escape');"
# 0

./vendor/bin/phpunit test/unit/CurlModuleTest.php test/unit/CurlExtensionPolicyTest.php test/unit/CurlEscapeBuiltinTest.php
# OK

php bin/compile.php -l test/repro/maintainer_gap_curl_escape_phantom_signature.php
# exit 0

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