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/Providers/class-groq-ai-provider-manager.php

@@ -0,0 +1,24 @@
+<?php
+
+class Groq_AI_Provider_Manager {
+	/** @var Groq_AI_Provider_Interface[] */
+	private $providers = [];
+
+	public function __construct() {
+		$this->register_provider( new Groq_AI_Provider_Groq() );
+		$this->register_provider( new Groq_AI_Provider_OpenAI() );
+		$this->register_provider( new Groq_AI_Provider_Google() );
+	}
+
+	public function register_provider( Groq_AI_Provider_Interface $provider ) {
+		$this->providers[ $provider->get_key() ] = $provider;
+	}
+
+	public function get_providers() {
+		return $this->providers;
+	}
+
+	public function get_provider( $key ) {
+		return isset( $this->providers[ $key ] ) ? $this->providers[ $key ] : null;
+	}
+}