net.box: resolve IPROTO feature names using box.iproto.feature

Drop the IPROTO_FEATURE_NAMES table and use box.iproto.feature in
iproto_feature_resolve so that we don't have to update it manually every
time we add a new feature.

Follow-up #8443
Follow-up commit b3fb883b ("iproto: export IPROTO constants to Lua
automatically")

NO_DOC=refactoring
NO_TEST=refactoring
NO_CHANGELOG=refactoring