Function run_trace 

pub fn run_trace(query: TraceQuery) -> Result<Option<CallTree>>

Orchestrates the call graph tracing process

This function:

1. Finds the starting function definition
2. Extracts function calls or callers based on the direction
3. Builds a call graph tree up to the specified depth

Arguments

• query - Configuration for the trace operation

Returns

A CallTree representing the call graph, or None if the start function is not found.