Feat/TR-4494/add new symbols in Math PCI

[bziondik]

Related to: https://oat-sa.atlassian.net/browse/TR-4494
Based on:

• feat: add limit command mathquill#2

The following symbols are added in the Math Entry PCI virtual keyboard (follow links for visual representations):

• ratio
• congruence
• tangent
• limit
• subset
• superset
• element
• n-root
• sum
• Additional, not required - right arrow for limit approaches

To use source files for PCI:

1. run script php index.php '\oat\taoQtiItem\scripts\initEventCreatorLoad'
2. create file config/taoQtiItem/debug_portable_element.conf.php with

<?php
return [
'mathEntryInteraction' => 'qtiItemPci/views/js/pciCreator/ims/mathEntryInteraction/',
];
?>

[marpesia]

LGTM, good job!

Review Checklist

• New code is covered by tests (if applicable)
• Tests are running successfully (old and new ones) on my local machine (if applicable)
• New code is respecting code style rules
• New code is respecting best practices
• New code is not subject to concurrency issues (if applicable)
• Feature is working correctly on my local machine (if applicable)
• Acceptance criteria are respected
• Pull request title and description are meaningful
• Pull request's target is not master
• Commits are following conventional commits
• Commits messages are meaningful
• Commits are atomic
• Changelog is updated according to changes (if applicable)
• Documentation is updated according to changes (if applicable)

[github-actions]

Version

Target Version	8.3.0
Last version	8.2.2

There are 0 BREAKING CHANGE, 5 features, 0 fix

[Silvia-loza]

• New code is covered by tests (if applicable)
• Tests are running successfully (old and new ones) on my local machine (if applicable)
• New code is respecting code style rules
• New code is respecting best practices
• Pull request's target is not master
• Feature is working correctly on my local machine (if applicable)
• Acceptance criteria are respected
• Pull request title and description are meaningful