feat(deep-link): implement getCurrent on Windows/Linux (#1759)

* feat(deep-link): implement getCurrent on Windows/Linux

checks std::env::args() on initialization, also includes integration with the single-instance plugin

* fmt

* update docs, fix event

* add register_all function

* expose api

* be nicer on docs, clippy

.changes/config.json

@@ -268,7 +268,8 @@
     },
     "single-instance": {
       "path": "./plugins/single-instance",
-      "manager": "rust"
+      "manager": "rust",
+      "dependencies": ["deep-link"]
     },
     "sql": {
       "path": "./plugins/sql",