[Spike] Reduce eth daemon calls

[0xean]

1. open the app, with network tab filter on daemon.ethereum
2. connect demo wallet
3. notice the large amount of calls

We should take a look at why the app is so chatty here, work has been done to work on the approval calls, but we should understand this behavior and perhaps look to reduce this traffic if reasonably possible.

[0xean]

Some of the eth_calls seem related to Foxy

[gomesalexandre]

• There are two calls on splash screen, which should really not happen as we didn't connect a wallet. One is the UNI-V2 resolver of opportunitiesSlice, the other is the ethereum plugin. We should ensure things are lazy-loaded in both these cases.
• From there on, once a wallet is connected, there is a bunch of network request for opportunities meta/user-data. Work has already been done here to batch things - indeed @0xean many of these are related to FOXy, and removing support for it eventually will make things some better

[gomesalexandre]

Also related: ethers-io/ethers.js#3462 we're using JsonRpcBatchProvider for its caching capabilities but ironically, it doesn't have the chainId caching improvements of StaticJsonRpcProvider. See e.g Uniswap/routing-api#404.
While this indeed seems to reduce the number of calls (#6223), it looks like our issue is having multiple instances of providers for a given ChainId. Will use this PR to instantiate them only once, across web and packages