Add "Start invocation" in InvocationStateMachine, symmetric with "End invocation" log line

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Test Results

0 tests  ±0   0 :white_check_mark: ±0   0s :stopwatch: ±0s 0 suites ±0   0 :zzz: ±0  0 files   ±0   0 :x: ±0 

Results for commit f22dfea5. ± Comparison against base commit bf3db07c.

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Unit Test Results

  13 files  ±0    13 suites  ±0   10s :stopwatch: -1s 568 tests ±0  561 :heavy_check_mark: +1  7 :zzz: ±0  0 :x:  - 1  569 runs  ±0  562 :heavy_check_mark: +1  7 :zzz: ±0  0 :x:  - 1 

Results for commit f22dfea5. ± Comparison against base commit bf3db07c.