Add Google and Groq AI providers, enhance provider manager, and implement conversation and logging services

- Introduced `Groq_AI_Provider_Google` and `Groq_AI_Provider_Groq` classes for handling AI interactions with Google and Groq respectively.
- Enhanced `Groq_AI_Provider_Manager` to register and manage multiple AI providers.
- Implemented `Groq_AI_Conversation_Manager` for managing conversation IDs and context hashes.
- Added `Groq_AI_Generation_Logger` for logging AI generation events and managing log tables.
- Developed `Groq_AI_Prompt_Builder` for constructing prompts and processing AI responses.
- Established `Groq_AI_Settings_Manager` for managing plugin settings, including context fields and module configurations.

includes/Contracts/interface-groq-ai-provider.php

@@ -0,0 +1,21 @@
+<?php
+
+interface Groq_AI_Provider_Interface {
+	public function get_key();
+
+	public function get_label();
+
+	public function get_default_model();
+
+	public function get_available_models();
+
+	public function get_option_key();
+
+	public function generate_content( array $args );
+
+	public function supports_live_models();
+
+	public function fetch_live_models( $api_key );
+
+	public function supports_response_format();
+}