feat(metrics): add additional spell metrics [fixes NET-437]

[kmd-fl]

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[linear]

NET-437 Add spells metrics

1. Investigate if it's possible to collect metrics for spells separately from simple services [v]
2. Number of spells on all workers [v]
3. Spell queue size (in spell-bus)
4. Investigate what's possible to collect for metrics
5. Number of created/removed spells [v]
6. How much spell particles are created by host
7. Collect trigger config's periods (of currently running spells? of created spells?)