chore: add transactionId getter to Event class #1995

Job	Run time
app_jobs / coverage	2m 32s
app_jobs / dart_web_compatible	59s
app_jobs / database_web_tests	51s
app_jobs / coverage_without_olm	2m 10s
app_jobs / e2ee_test (synapse)	1m 54s
app_jobs / pub-dev-dry-run	29s
app_jobs / e2ee_test (dendrite)	1m 51s
dart / dart_analyzer	39s
general / conventional_commits	4s
app_jobs / e2ee_test (conduit)	1m 50s
app_jobs / merge_converage	14s
app_jobs / review_app_coverage / qa_app	0s
app_jobs / review_app_coverage / cleanup_review_app	9s
app_jobs / review_app_coverage / deploy_review_app	5s
	13m 47s

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