Replace Axios

[ptpaterson]

Ticket(s): FE-3060

Problem

We need to get rid of Axios, because it does not work in a lot of environments

Solution

Provide an initial implementation that just uses the native fetch API in browsers and Node. Add a custom fetch function to the client configuration that we can later provide various per-environment implementations (e.g. HTTP2 in Node), or that users can also provide.

Result

Driver works with browsers and Node.

Out of scope

• HTTP2 node implementation
• Tagged type encoding, but I added // WIP comments where it should be straightforward to drop that in when we're ready.

Testing

Tests updated to reflect new API. Notes:

• deleted: __tests__/integration/connection-pool.test.ts
• commented out some tests in __tests__/unit/query.test.ts. We should review and either delete them or determine their analog for the new HTTPClient.