Add support to retrieve invocations from idempotency key. Fix #358 (#… #208

All 84 tests pass in 22m 50s

102 files + 52 102 suites +52 22m 50s ⏱️ + 15m 51s
84 tests - 675 84 ✅ - 668 0 💤 - 7 0 ❌ ±0
215 runs - 544 215 ✅ - 537 0 💤 - 7 0 ❌ ±0

Results for commit cf60abf. ± Comparison against earlier commit cd23a59.