Case sensitive glossary option should be configurable

Problem/Motivation

At the moment it's hardcoded when using glossaries that they are not case sensitive

$glossaryConfig = new TranslateTextGlossaryConfig(
            [
              'glossary' => 'projects/' . $projectId . '/locations/' . $location . '/glossaries/' . $glossary,
              'ignore_case' => TRUE,
            ],
          );

This should be configurable.

Proposed resolution

Add that configuration to the settings and only add the "ignore_case" if that option is selected.