feat/jaeger: more spans, more stages (#2477)

* feat/jaeger: more spans, more stages

Stage numbers are still arbitrarily picked.

* feat/jaeger: additional spans

* chore/spellcheck: improve the dictionary

* fix/jaeger JaegerSpan -> jaeger::Span
10 jobs for master in 33 minutes and 46 seconds (queued for 13 seconds)