Feature: Wordpress Search Engine Optimization(SEO) Tool

[tybalex]

implements obot-platform/obot#2422

This PR adds a few SEO tools to help optimize post contents:

• Keywords Suggestion: use LLM and nlp methods to generate keywords suggestions that the user can focus on to optimize
• Long Tail Keywords: implemented based on google search long tail words.
• Keywords Density: given primary and secondary keywords, compute the appearance of those keywords in post content/title/sub-headings
• Readability: the ease of readability of the post content.

Obot user can incorporate this tool with the Wordpress Tool to improve posts. Another tool can be integrated is Google Search Console Tool