service: sm/kernel/loader: Implement QueryPointerBufferSize, automatic pointer buffer sizing, and SM service improvements

This commit introduces multiple improvements to IPC handling and system management services, enhancing game compatibility and emulator stability.

--- 1. Fully Implemented QueryPointerBufferSize Service:
- Exposes the per-process IPC pointer buffer size through `QueryPointerBufferSize` instead of returning stubbed values.
- Added `m_pointer_buffer_size` field to `KProcess`, initialized with a safe default (0x8000).
- Introduced getter and setter methods (`GetPointerBufferSize()` / `SetPointerBufferSize()`).
- Registered new handler in `sm_controller` for handling QueryPointerBufferSize requests.
- Ensures accurate buffer size reporting for games relying on this service.

--- 2. Automatic Pointer Buffer Sizing Per-Game:
- Automatically determines heap size by parsing `main.npdm` from the game’s ExeFS:
  - Heap size > 1 GiB → pointer buffer size set to `0x10000`.
  - Heap size > 512 MiB → pointer buffer size set to `0xC000`.
  - Otherwise, defaults to `0x8000`.
- Gracefully handles missing or malformed `main.npdm` by falling back to default settings.
- Automatically configures pointer buffer size during `AppLoader_NCA::Load`.
- Added logging for heap size detection and buffer size configuration for easier debugging.

--- 3. SM Service Improvements:
- Added full implementation of `QueryPointerBufferSize` within the SM service framework.
- Cleaned up stubbed methods and ensured correct domain handling.
- Registered new service commands (e.g., `SetPointerBufferSize` and `QueryPointerBufferSize`) in `sm_controller`.
- Improved session handling with proper conversion to domain objects where necessary.

--- Benefits:
- Greatly improves compatibility with games that require larger IPC pointer buffers
- Eliminates the need for manual per-game pointer buffer overrides.
- More accurate emulation of Switch system services, improving stability for both commercial titles and homebrew.
- Provides cleaner logging for easier debugging and maintenance.
- Future-proofs IPC handling for upcoming titles with higher memory demands.

--- Additional Notes:
- Default pointer buffer size remains 0x8000 for smaller titles or if heap size cannot be determined.
- Falls back to safe defaults without affecting overall emulator performance.
- All new service calls properly registered and integrated without breaking existing functionality.

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