CLI: Add gas config to the client.toml config file

[nicolaslara]

Background

Many CLI txs require custom gas configs. This is annoying to write every time and leads to long commands. We can add a config for this in client.toml specifying the default if they are not set

Suggested Design

Base it on CosmosContracts/juno#601

Acceptance Criteria

Txs on the CLI don't require --gas auto --gas-prices 0.1uosmo --gas-adjustment 1.3 as those can be directly picked up from the config

[hieuvubk]

Is anyone working on this?

[nicolaslara]

no, just added it yesterday when I was sick of copy pasting the gas params :p