Add ability to use custom prompt templates

- Changed prompt template format to yaml
- Adds a new class `PromptManager` to handle prompt templates assignment
- Adds a new parameter `custom_prompt_file` to allow users to submit path to their custom prompt templates yaml file, that will overwrite the default prompt templates
- All prompt related handling now consolidated within messages package
- Added support for the new Anthropic Claude 4 (Sonnet, Opus) models

Author: pgalko

LLM_CONFIG_sample.json

@@ -4,13 +4,13 @@
     {"agent": "Analyst Selector", "details": {"model": "claude-3-7-sonnet-20250219", "provider":"anthropic","max_tokens": 2000, "temperature": 0}},
     {"agent": "Theorist", "details": {"model": "gemini-2.5-pro-preview-05-06", "provider":"gemini","max_tokens": 4000, "temperature": 0}},
     {"agent": "Dataframe Inspector", "details": {"model": "gemini-2.0-flash", "provider":"gemini","max_tokens": 8000, "temperature": 0}},
-    {"agent": "Planner", "details": {"model": "gemini-2.5-pro-preview-05-06", "provider":"gemini","max_tokens": 8000, "temperature": 0}},
+    {"agent": "Planner", "details": {"model": "gemini-2.5-pro-preview-05-06", "provider":"gemini","max_tokens": 15000, "temperature": 0}},
     {"agent": "Code Generator", "details": {"model": "claude-3-5-sonnet-20241022", "provider":"anthropic","max_tokens": 8000, "temperature": 0}},
     {"agent": "Error Corrector", "details": {"model": "claude-3-5-sonnet-20241022", "provider":"anthropic","max_tokens": 8000, "temperature": 0}},
     {"agent": "Reviewer", "details": {"model": "gemini-2.5-pro-preview-05-06", "provider":"gemini","max_tokens": 8000, "temperature": 0}},
-    {"agent": "Solution Summarizer", "details": {"model": "gemini-2.5-flash-preview-04-17", "provider":"gemini","max_tokens": 4000, "temperature": 0}},
-    {"agent": "Google Search Executor", "details": {"model": "gemini-2.5-flash-preview-04-17", "provider":"gemini","max_tokens": 4000, "temperature": 0}},
-    {"agent": "Google Search Summarizer", "details": {"model": "gemini-2.5-flash-preview-04-17", "provider":"gemini","max_tokens": 4000, "temperature": 0}}
+    {"agent": "Solution Summarizer", "details": {"model": "gemini-2.5-flash-preview-05-20", "provider":"gemini","max_tokens": 4000, "temperature": 0}},
+    {"agent": "Google Search Executor", "details": {"model": "gemini-2.5-flash-preview-05-20", "provider":"gemini","max_tokens": 4000, "temperature": 0}},
+    {"agent": "Google Search Summarizer", "details": {"model": "gemini-2.5-flash-preview-05-20", "provider":"gemini","max_tokens": 4000, "temperature": 0}}
   ],
   "model_properties": {
     "gpt-4o": {"capability":"base","multimodal":"true", "templ_formating":"text", "prompt_tokens": 0.0025, "completion_tokens": 0.010},
@@ -21,13 +21,15 @@
     "o3-mini": {"capability":"reasoning", "multimodal":"false","templ_formating":"text", "prompt_tokens": 0.0011, "completion_tokens": 0.0044},
     "o1": {"capability":"reasoning", "multimodal":"false","templ_formating":"text", "prompt_tokens": 0.015, "completion_tokens": 0.06},
     "gemini-2.0-flash": {"capability":"base", "multimodal":"true","templ_formating":"text", "prompt_tokens": 0.0001, "completion_tokens": 0.0004},
-    "gemini-2.5-flash-preview-04-17": {"capability":"reasoning", "multimodal":"true","templ_formating":"text", "prompt_tokens": 0.00015, "completion_tokens": 0.0035},
+    "gemini-2.5-flash-preview-05-20": {"capability":"reasoning", "multimodal":"true","templ_formating":"text", "prompt_tokens": 0.00015, "completion_tokens": 0.0035},
     "gemini-2.0-flash-thinking-exp-01-21": {"capability":"reasoning", "multimodal":"false","templ_formating":"text", "prompt_tokens": 0.0, "completion_tokens": 0.0},
     "gemini-2.5-pro-exp-03-25": {"capability":"reasoning", "multimodal":"true","templ_formating":"text", "prompt_tokens": 0.0, "completion_tokens": 0.0},
     "gemini-2.5-pro-preview-05-06": {"capability":"reasoning", "multimodal":"true","templ_formating":"text", "prompt_tokens": 0.00125, "completion_tokens": 0.01},
     "claude-3-5-haiku-20241022": {"capability":"base", "multimodal":"true","templ_formating":"xml", "prompt_tokens": 0.0008, "completion_tokens": 0.004},
     "claude-3-5-sonnet-20241022": {"capability":"base", "multimodal":"true","templ_formating":"xml", "prompt_tokens": 0.003, "completion_tokens": 0.015},
     "claude-3-7-sonnet-20250219": {"capability":"base", "multimodal":"true","templ_formating":"xml", "prompt_tokens": 0.003, "completion_tokens": 0.015},
+    "claude-sonnet-4-20250514": {"capability":"base", "multimodal":"true","templ_formating":"xml", "prompt_tokens": 0.003, "completion_tokens": 0.015},
+    "claude-opus-4-20250514": {"capability":"base", "multimodal":"true","templ_formating":"xml", "prompt_tokens": 0.015, "completion_tokens": 0.075},
     "open-mixtral-8x7b": {"capability":"base", "multimodal":"false","templ_formating":"text", "prompt_tokens": 0.0007, "completion_tokens": 0.0007},
     "mistral-small-latest": {"capability":"base", "multimodal":"false","templ_formating":"text", "prompt_tokens": 0.001, "completion_tokens": 0.003},
     "codestral-latest": {"capability":"base", "multimodal":"false","templ_formating":"text", "prompt_tokens": 0.001, "completion_tokens": 0.003},