feat: use own xrpc client

[anbraten]

Tested how the lib could work. For now I've added a xrpc-client that takes a session (either password or later on oauth). The client can now be used by tsky to do api calls.

It would be use like this:

const session = new PasswordSession(TEST_ENDPOINT);
await session.login('did:from-alice', 'alice has a nice app password');
const tSky = new TSky(session);

Currently I got those two calls to work:

For the user's profile:

const profile = await tSky.profile(TEST_CREDENTIALS.alice.did);
console.log(profile);

To get the timeline of the user:

const paginator = tSky.feed.timeline({
  limit: 30,
});

await paginator.next(); // load the first page

console.log(paginator.values[0].feed); // print the feed array from the first page

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[anbraten]

While baking on these changes I've noticed that we would need to replicate the quite well developed xrpc-client and session refreshing parts from atproto or atcute. Therefore it might be a good idea to for example use the atcute client underneath.