feat: add NetworkController NetworkConfiguration actions and events

[Prithpal-Sooriya]

Explanation

This adds and exposes actions and events when adding, updating, or removing a NetworkConfiguration.

Events:

• NetworkController:networkAdded
• NetworkController:networkUpdated
• NetworkController:networkRemoved

Actions

• NetworkController:addNetwork
• NetworkController:updateNetwork
• NetworkController:removeNetwork

References

https://consensyssoftware.atlassian.net/browse/NOTIFY-1089

Changelog

@metamask/network-controller

• ADDED: add events NetworkController:networkAdded; NetworkController:networkUpdated; NetworkController:networkRemoved
• ADDED: add actions NetworkController:addNetwork; NetworkController:updateNetwork; NetworkController:removeNetwork

Checklist

• [x] I've updated the test suite for new or updated code as appropriate
• [x] I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• [x] I've highlighted breaking changes using the "BREAKING" category above as appropriate