rpc: Store and serve the event transaction ID #3266

Job	Run time
Unit tests (ubuntu-20.04, 1.21)	8m 4s
Integration tests (ubuntu-20.04, 1.21, .CLI.)	15m 59s
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 21s
Unit tests (ubuntu-22.04, 1.21)	6m 25s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	14m 1s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	2m 35s
Integration tests (ubuntu-22.04, 1.21, .CLI.)	15m 44s
Integration tests (ubuntu-22.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	13m 21s
Build (macos-latest, x86_64-apple-darwin, amd64)	5m 27s
Build (macos-latest, aarch64-apple-darwin, arm64)	5m 15s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	8m 33s
	1h 37m 45s

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