feat: refactor TileDBClient to support versioned API clients

[tdbbyd]

This PR refactors the TileDBClient to support versioned API calls. Previously we were only allowing v1 through the TileDBClient wrapper object.

example usage now:

TileDBClient client = new TileDBClient(
    new TileDBLogin(myApiKey, true, true, false) 
);

// get v1
io.tiledb.cloud.rest_api.v1.ApiClient v1 = client.getV1Client();

// get v4
io.tiledb.cloud.rest_api.v4.ApiClient v4 = client.getV4Client();

// get v2
io.tiledb.cloud.rest_api.v2.ApiClient v2 = client.getV2Client();

This PR also marks the existing getApiClient() as deprecated. Users should start using getV1Client();