Add fmtlib support to EventContext

For me, the main question is if we want to have it available all the time or on demand, like I did for Property.

The following discussion from !1589 (merged) should be addressed:

@fwinkl started a discussion: (+1 comment)

Shouldn't this be moved to EventContext.h ?

Edited Jun 04, 2024 by Marco Clemencic

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