[Feature]: Allow overriding the client.toml config

[ValarDragon]

Summary

Duplicate of #5540 , but for client.toml

Problem Definition

We would like to override some client displays and inputs in Osmosis, based on new config options we'd add to client.toml.

We're currently doing this the "old" way we did app.toml. It would be preferrable to do the more composable solution built for app.toml, if its not too much work to add it for client.toml :)

[julienrbrt]

Just curious, what is the "old" way? Is it like Juno is doing (https://github.com/CosmosContracts/juno/blob/66c7a1e54c231f408722b43d5e99ea6f42a1e303/cmd/junod/cmd/config.go#L148)?

[ValarDragon]

I think it looks fiarly similar: https://github.com/osmosis-labs/osmosis/blob/1735d8b83bd351c26885efb41c1861c99de010fb/cmd/osmosisd/cmd/config.go