Add support for multiple chain types in the configuration

[romac]

Summary

Add support for multiple chain types in the configuration.

Problem Definition

We will eventually need to enable support for non-Cosmos chains or for variations on Cosmos chains (eg. for chains with the psql indexer enabled).

A first step towards this would be to add a chain_type field to the ChainConfig which specifies what kind of chain runtime to instantiate.

Proposal

Add a chain_type: ChainType field to the ChainConfig and inspect its value to decide which chain endpoint implementation to instantiate.

Acceptance Criteria

Setting chain_type = 'CosmosSdk' in the config does not raise an error and instantiates a CosmosSdkChain in all commands (start included).

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