Cleanup: Query Endpoints

Changes:

• /tx/out_hash should cross-ref out to ins
• /tx/in_hash/voter should be /tx/in_hash/signers
• /tx/in_hash/voter returns duplicate information in .tx as .in_tx
• /lastblock is not returning heights for all chains in multichain
• /nodeaccounts rename to /nodes and /node/{node}
• /pool_addresses rename to /inbound_addresses
• /vault rename to /network (all network-wide information here)
• Vaults to return addresses as well as pubkeys

Additions:

• Add /doc to return a swagger file of endpoints (https://gitlab.com/zheye/thorchain-sdk/-/blob/master/openapis/thornode.yml) -> https://gitlab.com/thorchain/thornode/-/blob/master/docs/api/blueprint.apib

Removals:

• /observers /observer/node duplicates /nodeaccounts so remove those two
• /nodeaccountcheck info put on /node/{node} endpoint and remove (remove jail and put in preflight_
• /tsssigner duplicates info that is on {/vault/asgard}.signing_party so remove

Add one-line comment on all endpoints that describe in plain English what they do.