More helpful error message when failing to load BBOT module

[TheTechromancer]

When a pip package is missing, it's usually because the user has artifacts leftover in ~/.bbot from an older version. This improves the error message.

It also adds the BBOT version to the cache key, which should help prevent this error to begin with.

FYSA @pjhartlieb

[github-actions]

📊 Performance Benchmark Report

Comparing dev (baseline) vs more-helpful-error (current)

📈 Detailed Results (All Benchmarks)

📋 Complete results for all benchmarks - includes both significant and insignificant changes

🧪 Test Name	📏 Base	📏 Current	📈 Change	🎯 Status
Bloom Filter Dns Mutation Tracking Performance	4.22ms	4.20ms	-0.4% ⚪	✅
Bloom Filter Large Scale Dns Brute Force	17.62ms	17.42ms	-1.1% ⚪	✅
Large Closest Match Lookup	358.62ms	360.99ms	+0.7% ⚪	✅
Realistic Closest Match Workload	194.85ms	196.08ms	+0.6% ⚪	✅
Event Validation Full Scan Startup Small Batch	454.96ms	455.85ms	+0.2% ⚪	✅
Event Validation Full Scan Startup Large Batch	793.24ms	797.56ms	+0.5% ⚪	✅
Make Event Autodetection Small	32.27ms	30.99ms	-3.9% ⚪	✅
Make Event Autodetection Large	326.07ms	316.11ms	-3.1% ⚪	✅
Make Event Explicit Types	14.45ms	13.86ms	-4.1% ⚪	✅
Excavate Single Thread Small	4.116s	3.985s	-3.2% ⚪	✅
Excavate Single Thread Large	9.512s	9.430s	-0.9% ⚪	✅
Excavate Parallel Tasks Small	4.159s	4.223s	+1.5% ⚪	✅
Excavate Parallel Tasks Large	7.078s	7.057s	-0.3% ⚪	✅
Is Ip Performance	3.15ms	3.21ms	+2.0% ⚪	✅
Make Ip Type Performance	11.39ms	11.52ms	+1.1% ⚪	✅
Mixed Ip Operations	4.56ms	4.49ms	-1.4% ⚪	✅
Typical Queue Shuffle	61.76µs	61.65µs	-0.2% ⚪	✅
Priority Queue Shuffle	689.33µs	716.76µs	+4.0% ⚪	✅

🎯 Performance Summary

✅ No significant performance changes detected (all changes <10%)

---

🐍 Python Version 3.11.14

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 92%. Comparing base (9e32196) to head (c7bbfe7).
⚠️ Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/core/modules.py	50%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #2798   +/-   ##
=====================================
- Coverage     92%     92%   -0%     
=====================================
  Files        411     411           
  Lines      34009   34013    +4     
=====================================
- Hits       31053   31039   -14     
- Misses      2956    2974   +18     

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