Add Git and Open VSX registry ('Extension') support #275

All 41 tests pass in 2m 33s

3 files ±0 27 suites ±0 2m 33s ⏱️ +13s
41 tests ±0 41 ✅ ±0 0 💤 ±0 0 ❌ ±0
123 runs ±0 123 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit 0294db0. ± Comparison against earlier commit a72f90d.