Chore/linterupdates

[carlmontanari]

• updates golangci-lint settings (adds stuff, fixes bad config)
• fixes allocation for multi response output (was allocating then appending as apposed to stuffing output in the right index in the array)
• re-gens test data after the previous update
• removes unnecessary nolints
• fixes some too long lines (purely cosmetic)
• makes a few numbers consts (cosmetic)
• checks error in channel read with errors.Is instead of equality (to io.EOF)
• checks type assertions in a few places we just assumed that type assertions would be ok (they probably would be... but now we explicitly check and... still panic, but at least we did it explicitly and w/ a message of our own!)