Added components for difficulty adjustment

[Randy808]

To run locally, npm install and use the following snippets:

# Bitcoin
export API_URL=https://blockstream.info/api
export PORT=4999
source flavors/blockstream/config.env
source flavors/bitcoin-mainnet/config.env
npm run dev-server

# Liquid
export API_URL=https://blockstream.info/liquid/api
export PORT=5000
source flavors/blockstream/config.env
source flavors/liquid-mainnet/config.env
npm run dev-server

---

Bitcoin:

Liquid:
No change to Liquid views

[FedOken]

https://wiki.bitcoinsv.io/index.php/Difficulty

In the original implementation, still used by Bitcoin Core (BTC), the difficulty can rise by a maximum of 400% of the current difficulty in a single adjustment.
In the original implementation, still used by Bitcoin Core (BTC), the network's difficulty can adjust downwards by up to 75% of the current difficulty in a single adjustment.

I think we should set limits regarding the protocol, regardless of the numbers that might be included in the calculation.

[Randy808]

I'm not convinced this belongs in the visualization layer. As I see it, this view is intended to visualize the calculated values rather than validate them against consensus rules.

If the calculated adjustment were to exceed the protocol's ±400%/-75% limits, what would we do with that information? Would we display a warning that the calculated value is invalid according to consensus? If so, I'm not sure why we'd make this particular consensus rule special when we don't surface other consensus validity checks here.