feat: ffi to replace plugins (#11152)

This commit removes implementation of "native plugins" and replaces
it with FFI API.

Effectively "Deno.openPlugin" API was replaced with "Deno.dlopen" API.

cli/tests/unit/test_util.ts

@@ -32,7 +32,7 @@ interface UnitTestPermissions {
   net?: boolean;
   env?: boolean;
   run?: boolean;
-  plugin?: boolean;
+  ffi?: boolean;
   hrtime?: boolean;
 }
 
@@ -84,7 +84,7 @@ export function unitTest(
       net: false,
       env: false,
       run: false,
-      plugin: false,
+      ffi: false,
       hrtime: false,
     }, options.perms),
   };