[Docs]: Add Glossary

[jnikhila]

Is there an existing issue for this?

• [X] I have searched the existing issues

GitBook Insights searchTerms or link

To be added - Dancia

Google Analytics - search terms or a link

To be added - Dancia

Discord/slack/intercom Link if needed

https://theappsmith.slack.com/archives/C02805TDC8K/p1666023764649099

Describe the problem

We don't have a glossary defining the standard/common terms in Appsmith.

Describe the improvement

Add a glossary that defines the standard/common terms used in Appsmith.

Why do you think this change is needed?

The glossary will help users speak and understand the terminologies used in Appsmith.