[WIP] Init shard and history engine with fx

[dnr]

What changed?

Use fx to construct shard context, history engine, and history api handlers.

Why?

Reduce boilerplate, make dependencies more explicit,

How did you test it?

• [x] built
• [ ] run locally and tested manually
• [ ] covered by existing tests
• [ ] added new unit test(s)
• [ ] added new functional test(s)