Sei remote sign hotfix: aggregate tcp chunks before unmarshal proto #5

Job	Run time
Clippy	3m 26s
Build (stable)	34s
Rustfmt	8s
Build (1.74.0)	50s
Check	40s
Test Suite (stable)	45s
Validate against test harness	16s
Test Suite (1.74.0)	51s
	7m 30s

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