chore: Remove unnecessary events dependency (#473)

This dependency was not used anywhere. Previously it was brought in
because an older version of this controller extended `EventEmitter`,
but even then the package wasn't really used (the Node.js events module
was resolved instead).

We're not even using `EventEmitter` anymore since the migration to the
`BaseControllerV2` base class.

Author: Gudahtt

package.json

@@ -35,7 +35,6 @@
     "@metamask/eth-query": "^4.0.0",
     "@metamask/polling-controller": "^12.0.0",
     "bignumber.js": "^9.0.1",
-    "events": "^3.3.0",
     "fast-json-patch": "^3.1.0",
     "lodash": "^4.17.21"
   },

yarn.lock

@@ -1678,7 +1678,6 @@ __metadata:
     eslint-plugin-n: ^15.7.0
     eslint-plugin-prettier: ^4.2.1
     eslint-plugin-promise: ^6.1.1
-    events: ^3.3.0
     fast-json-patch: ^3.1.0
     isomorphic-fetch: ^3.0.0
     jest: ^29.7.0
@@ -4012,13 +4011,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"events@npm:^3.3.0":
-  version: 3.3.0
-  resolution: "events@npm:3.3.0"
-  checksum: f6f487ad2198aa41d878fa31452f1a3c00958f46e9019286ff4787c84aac329332ab45c9cdc8c445928fc6d7ded294b9e005a7fce9426488518017831b272780
-  languageName: node
-  linkType: hard
-
 "execa@npm:^5.0.0, execa@npm:^5.1.1":
   version: 5.1.1
   resolution: "execa@npm:5.1.1"