feat(playground): add guest without reservation to hotel example #1238

Job	Run time
API Docs Validation	10s
Gradle Wrapper Validation	5s
fbs-core.api / DB Migration Validation	2s
fbs-eat / Lint	46s
fbs-sql-checker / Lint	33s
fbs-eat / Test	22s
fbs-sql-checker / Test	22s
Build Docker images	5m 21s
fbs-core.api / Test	2m 21s
fbs-runner.checker / Test	38s
fbs-core.api / Lint	41s
fbs-core.web / Lint	1m 15s
fbs-core.web / Test	2m 25s
fbs-runner.checker / Lint	23s
	15m 24s

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