feat: add ipmi_sel_events_time

[HappyFX]

Add type in ipmi_sel_events_count_by_state - so it can be distinguish between sel events

ipmi_sel_events_count_by_state{type="Power Supply",state="Critical"} 18

Add new metric about more detailed resent time occurrence event in log, so it can be stored in prometheus even after sel log was cleared.
It's not 1-1 sel log event copy, so it won't be with big cardinality. 18 real event are presented as 4 metrics with resent time occurrence

ipmi_sel_events_time{event="Power Supply Failure detected",name="Power Supply 2 Status",state="Critical",type="Power Supply"} 1.731064451e+09
ipmi_sel_events_time{event="Power Supply Failure detected ; Fan Fault",name="Power Supply 2 Status",state="Critical",type="Power Supply"} 1.731064449e+09
ipmi_sel_events_time{event="Power Supply input lost (AC/DC)",name="Power Supply 2 Status",state="Critical",type="Power Supply"} 1.727789819e+09
ipmi_sel_events_time{event="Redundancy Lost",name="System Board PS Redundancy",state="Critical",type="Power Supply"} 1.731064452e+09