Add option to indent REST responses

[fedekunze]

Summary

Use utils.PostProcessResponse(w, cdc, response, indent) to indent responses on all endpoints

Problem Definition

Some endpoints are missing utils.PostProcessResponse(w, cdc, response, indent) which gives the option to indent the JSON response for clients.

Proposal

Use it on all the LCD endpoints

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[alexanderbez]

Closing this issue as it seems dead -- please reopen if need be or it hasn't been addressed.