Display checkpoint hit count and ignore count

## Description

VICE checkpoint info already includes `hit_count` and `ignore_count` fields, but these are not exposed in the Ghidra trace.

## Proposed implementation

- Add `_hit_count` and `_ignore_count` attributes to `ViceBreakpoint` objects in `put_breakpoints()`
- Include hit count in the breakpoint `_display` string (e.g., `[3] 0xC000 SW_EXECUTE EN (hits: 42)`)
- Optionally add a `set_ignore_count` method to configure ignore counts from Ghidra

## Why this matters

Visibility into hit counts helps users understand code execution patterns (how often a routine is called, whether a watchpoint is being triggered by DMA vs CPU, etc.).