[Attribution] Initial MCP integration to make NVRx attr module as a tool of nvidia-resiliency agent

[sbak5]

This PR is the initial integration of NVRx attribution with MCP interface to make NVRx attribution modules as tools of nvidia-resiliency MCP agent.

many unnecessary steps inattribution/base.py are removed and simplified.
(e.g. async control of dependent modules in the preprocess step and internal control depending on the AttributionState of the dependent modules)
this integration assumes any orchestration of attr modules happens on the MCP client side.
So, any pipeline using multiple modules are defined in the MCP client as following

log_result = await client.run_module (module_name = "log_analyzer")
fr_result = await client.run_module (module_name = "fr_analyzer")
combined_log_fr_analysis = await client.run_module(module_name = 'combined_analyzer", input=(log_result, fr_result))