refactor: de/encode protobuf-encoded byte array with base64 (#2545) #10038

Job	Run time
Spell Check with Typos	26s
Check	3m 8s
Toml Check	1m 2s
Sqlness Test (ubuntu-latest-8-cores)	4m 23s
Rustfmt	1m 3s
Clippy	4m 1s
Sqlness Test (windows-latest-8-cores)	9m 16s
coverage	10m 45s
test-on-windows	15m 29s
	49m 33s

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