kernel minor and major numbers should be part of info metrics

[Garagoth]

Right now there are metrics lvm_lv_kernel_minor and lvm_lv_kernel_major (and same for vg and pv). It is really hard to join those metrics to anything, as promql does not really offer anything to join label value and metric value. Also, those are not things that change frequently, should be in _info metrics. Same as for example node_exporter adds major and minor labels to node_disk_info metric.