[ide-debugger] Minimal version of aptos-core changes to support debugger

[mkurnikov]

Debugger itself lives in my repo for now, but the plan is to move it into the monorepo eventually.
https://github.com/aptos-labs/aptos-debugger

Note:
Global mutex -> thread-local change for context is for debugger tests to work, otherwise they step onto each other.

---

Note

Medium Risk
Thread-local debug stepping replaces a process-wide mutex, which changes behavior when MOVE_VM_STEP runs concurrently; most code is behind debugger but the tracing refactor affects stepping-enabled tests.

Overview
Adds a debugger Cargo feature across the Move CLI, VM runtime, VM types, and move-unit-test so IDE-style debugging can plug in without affecting default builds.

VM stepping and debug hooks are refactored: DebugContext is a trait (default MoveStepDebugContext), the debug module is public, and stepping state moves from a global mutex to thread-local storage so parallel debugger/unit tests can install custom contexts and toggles per worker. New APIs include set_debug_context, set_debugging_enabled, capture_debug_thread_state, and get_source_locator.

Interpreter and values expose debugger-only introspection (get_frame_locals, load_struct_type, stack depth, public value/container types, Locals::borrow_values).

Aptos source mapping resolves modules by name when on-chain addresses differ from local dev addresses, and lists known source files for the IDE.

move-unit-test propagates captured debug thread state into each Rayon thread when the feature is enabled.

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