nixos/kubernetes: allow setting multiple kubelet dns resolvers

The current kubernetes module only allows you to set a single DNS
resolver for the kubelet. Historically, this has not mattered as the
value was passed to a cli argument as a string and as per the kubelet's
configuration parsing mechanism, multiple values could be passed as a
comma-delimited string. However, recently, the module was refactored to
make configure kubernetes components via configuration files rather than
the deprecated command-line arguments. These files more strongly-typed
than CLI arguments and to pass multiple values, one must define a list
in the file. When this change was made, an incorrect assumption was made
that only a single DNS server could be specified and forced a
single-item list into this configuration file. We need to introduce a
breaking change to the module in order to allow the user to supply their
own list with however many dns resolvers they wish to use.

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