node-opcua / node-opcua-pki / 22540489712

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fix: prevent EPERM crash on Windows + Node < 22
when watched directories are removed

Chokidar v4 with persistent:false does not register
an error handler on the underlying fs.watch handles
(handler.js l.160-168). On Windows + Node < 22, the
native FSWatcher fires EPERM when the watched
directory is removed, causing an uncaught exception.

Use a single shared fs.watch() interception across
all 5 watcher creations that adds an error handler
to each captured handle. The interception stays
active until all watchers emit "ready" (chokidar
creates fs.watch handles asynchronously during
directory scanning).

Also add test_watcher_eperm.ts with two tests:
- directory removal while CM is alive
- rapid create/init/rm/dispose cycles

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