feat: export Treaty namespace from treaty2

[Vahelnir]

Hi,

While implementing a simple composable to facilitate using treaty2 with Nuxt, I noticed that treaty2's Treaty namespace and TreatyResponse type were not exported. We can currently import EdenTreaty and EdenFetch from @elysiajs/eden/treaty and @elysiajs/eden/fetch respectively, but not Treaty.

I also noticed that the types Treaty, EdenTreaty and EdenFetch were imported by the entrypoint, but were never used at all. Were they meant to be exported here ?

I'm not sure what solution would preferred, so I implemented two different solutions in two different commits:

• 1215bc3d124d9530623df8a0879b09b429455e42 which create a new named export: @elysiajs/eden/treaty2;
• 68ec5b1a4124734eed5fd56f1fdfb3f28691c455 that exports Treaty from @elysiajs/eden.