feat(Storagecontrol): Adding new library sample

[vishwarajanand]

Fixes googleapis/google-cloud-php#7243

Storagecontrol Library already created googleapis/google-cloud-php#7245

Tests pass on prod:

➜  storagecontrol git:(feat_storage_control) ✗ ../testing/vendor/bin/phpunit -c phpunit.xml.dist
PHPUnit 9.6.19 by Sebastian Bergmann and contributors.

Warning:       XDEBUG_MODE=coverage or xdebug.mode=coverage has to be set

.                                                                   1 / 1 (100%)

Time: 00:03.340, Memory: 10.00 MB

OK (1 test, 2 assertions)
➜  storagecontrol git:(feat_storage_control) ✗

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• storagecontrol/src/quickstart.php:18, tag storage_control_quickstart_sample

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