FieldContext, MappedObjectContext: initialize Type lazily #668

Job	Run time
Coding standard (ubuntu-latest, 8.4)	17s
Static analysis (ubuntu-latest, 8.4)	22s
Tests (ubuntu-latest, 7.4, false)	37s
Test for mutants (ubuntu-latest, 8.4)	2m 19s
Tests (ubuntu-latest, 8.0, false)	37s
Tests (ubuntu-latest, 8.1, false)	39s
Tests (ubuntu-latest, 8.2, false)	40s
Tests (ubuntu-latest, 8.3, false)	26s
Tests (ubuntu-latest, 8.4, false)	27s
Tests (ubuntu-latest, 7.4, --prefer-lowest --prefer-stable, false)	41s
Tests (ubuntu-latest, 8.4, --ignore-platform-req=php+, true)	26s
Tests (macos-latest, 8.4, false)	1m 30s
Tests (windows-latest, 8.4, false)	1m 4s
Code coverage finish (ubuntu-latest, 8.4)	3s
Status check - CI	7s
	10m 15s

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