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.

assets/css/settings.css

@@ -0,0 +1,31 @@
+.groq-ai-model-field select {
+	min-width: 300px;
+}
+
+.groq-ai-model-custom {
+	margin-top: 10px;
+}
+
+#groq-ai-refresh-models {
+	margin-top: 10px;
+}
+
+#groq-ai-refresh-models-status {
+	margin-top: 6px;
+	font-size: 13px;
+}
+
+#groq-ai-refresh-models-status[data-status='error'] {
+	color: #b32d2e;
+}
+
+#groq-ai-refresh-models-status[data-status='success'] {
+	color: #008a20;
+}
+
+.groq-ai-context-defaults label {
+	display: flex;
+	gap: 8px;
+	align-items: center;
+	margin-top: 8px;
+}