feat: expose V4 public interface

Squashed commits:
 * wip: bump version of matt plugin to 0.0.4 with correct windows filename
 * wip: debug logs for plugin installer
 * wip: make install CLI work on windows
 * chore: use curl > wget in scripts
 * chore: run v4 examples in CI
 * chore: install plugins for build
 * chore: update to latest @types/node

examples/v4/plugins/.mocharc.json

@@ -0,0 +1,10 @@
+{
+  "bail": true,
+  "reporter": "spec",
+  "colors": true,
+  "timeout": 30000,
+  "exit": true,
+  "require": ["ts-node/register", "source-map-support/register"],
+  "full-trace": true,
+  "recursive": true
+}