Cleanup API endpoints and rename ICSxx references on Swagger docs

[fedekunze]

Summary

Currently the API docs from swagger have ICS (InterChain Standards) that we haven't agreed upon. These will conflict with the real ICS in the future (cc: @cwgoes).

Proposal

Structure the endpoints categories according to the following:

• Tendermint RPC: endpoints from https://tendermint.com/rpc that are not overwritten by others on the SDK (/tx and /tx_search)
• Transactions: endpoints matching/txs*. Currently under ICS0
• Misc: currently under Version
• Auth
• Bank: delete GET /bank/balances/{address} which is a dup from GET /auth/accounts/{address}
• Staking: delete GET /staking/delegators/{delegatorAddr}/txs which is a dup from the tx query
• Distribution
• Slashing
• Governance
• Minting

cc: @hschoenburg @gamarin2

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[cwgoes]

Thanks - yes, I think we want to restrict the "ICS" designator to specifications in the cosmos/ics repo.

[jackzampolin]

This is a great comment. Going to assign @hschoenburg

[hschoenburg]

ok I've got this PR up https://github.com/cosmos/cosmos-sdk/pull/4429/files

Note, I can't seem to build the docs to double check. The swagger.yaml file is valied YAML according to swagger.io but I can't figure out how to verify further.