Abstract and encapsulate jquery features

[richard-jones]

• PR: [when the PR is created, put a link to it here. DO NOT use the "linked PR" feature]

---

We want to be able to encapsulate the jquery behaviour so that we can easily deploy embedded edges in sites that already have jquery and the $ global.

That is, edges should provide all of the basic utility methods, and they should wrap jquery in such a way that it's easy for us to provide or use an existing jquery, or even theoretically switch it out for an alternative utility library depending on the situation.

Acceptance Criteria

• No jquery operations directly in edges code
• can deploy an embedded edge with a different version of jquery in the host site