feat: use getOfflineSignerOnlyAmino to see human readable message details

[mhagel]

Description

Related: #1982

This is an experimental PR.

Keplr does not currently have great support for displaying human-readable proto sign-docs for custom messages.
But their docs indicate that you can use the amino API to achieve this.

This PR does this by always using getOfflineSignerOnlyAmino, even for proto messages. I'm not sure if this is the direction we want to go, but it is worth testing and discussing.

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[blushi]

tACK