feat: add new experiment notebook and visualization

- Added `aoi_cache_experiment_eval.ipynb`: A Jupyter notebook evaluating cache performance based on TTL (Time-to-Live) with hit rate and average age analysis. It includes visualizations and experiment results.
- Removed the unused `experiment_name` variable in `aoi_cache_simulation.ipynb`.
- Added `experiments/hr_and_age_vs_ttl.png`: A plot visualizing the relationship between hit rate and TTL, complementing the cache evaluation experiments.

### Reason
The new notebook enhances experiment evaluation by providing a detailed analysis of cache behavior over different TTL values. The image file adds a visualization of the results. The removal of the `experiment_name` variable cleans up the simulation code, as it was not being utilized.

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

aoi_cache_simulation.ipynb

@@ -20,7 +20,6 @@
     "class CacheType(Enum):\n",
     "    LRU = 1\n",
     "    RANDOM_EVICTION = 2\n",
-    "experiment_name = ''\n",
     "\n",
     "# Constants\n",
     "SEED = 42\n",