[indexer] use in memory buffer to store obj changes and update snapsh… #69359

Job	Run time
diff	8s
license-check	1m 14s
release-notes-check	12s
test-extra (ubuntu-ghcloud)	7m 44s
simtest	4m 49s
test (ubuntu-ghcloud)	4m 9s
windows-build (windows-ghcloud)	15m 49s
clippy	4m 30s
rustfmt	19s
move-test	0s
test-extra	0s
cargo-deny (advisories, licenses, bans, ...)	2m 0s
test	0s
graphql-rpc	3m 40s
cutting a new execution layer	1m 19s
move-auto-formatter-ci-test	0s
	45m 53s

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