The ‘max_gas_burnt_view’ affects the RPCs only and therefore doesn’t
need to be part of the consensus.  In other words, all nodes could
have this value customised rather than using an agreed upon value
from genesis configuration.

Introduce a ‘max_gas_burnt_view’ field to ClientConfig and
a corresponding flag to ‘init’ and ‘run’ subcommands.  When present,
it will override the limit used by the node ignoring whatever is
stored in genesis configuration.

Fixes: near#3080