docs: add coprocessor docs for signed apps #1653

Job	Run time
setup-local-ic	2m 15s
solidity contracts	1m 59s
build	12m 59s
tests	16m 9s
schema-checks	9m 21s
IBC transfer OSMO->JUNO->GAIA PFM e2e test	11m 20s
IBC transfer OSMO->NTRN e2e test	11m 49s
2 party POL Astroport on Neutron e2e test	16m 29s
Osmosis GAMM e2e lp -> lw run	17m 10s
Osmosis concentrated liquidity e2e lp -> lw run	17m 12s
IBC transfer JUNO->NTRN e2e test	12m 48s
token swap e2e test	13m 52s
authorization & processor polytone integration test	23m 20s
IBC transfer NTRN->JUNO e2e test	12m 11s
IBC transfer NTRN->JUNO->GAIA PFM e2e test	12m 30s
Valence ica & ica libraries e2e	15m 21s
Ethereum e2e tests	16m 48s
	3h 43m 33s

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