Sei remote sign hotfix: aggregate tcp chunks before unmarshal proto #1

Job	Run time
Clippy	1m 3s
Rustfmt	8s
Build (stable)	3m 43s
Check	1m 3s
Build (1.72.0)	3m 50s
Test Suite (stable)	2m 38s
Validate against test harness	1m 55s
Test Suite (1.72.0)	2m 54s
	17m 14s

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