Add centralized checkstyle for non-inclusive terms

[peternied]

To aid in detection and removal of non-inclusive terms, add a checkstyle error when they are detected. See plugin specific implication opensearch-project/security#1782

We should expand these checks so that there is a new gradle task that all plugins can onboarded that makes sure we trend non-inclusive terms to zero and makes sure such terms are not added back into the codebase.