split up PoS params into sub-keys #964

Job	Run time
build-binaries	9m 46s
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	4m 40s
check-packages	6m 37s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	3m 53s
changelog	16s
lints	5m 45s
rust-docs	6m 28s
test-unit	11m 9s
test-integration	17m 17s
test-wasm	7m 32s
check-benchmarks	10m 43s
test-e2e-with-device-automation	9m 36s
test-e2e (0)	26m 12s
test-e2e (1)	11m 39s
test-e2e (2)	17m 31s
test-e2e (3)	12m 53s
test-e2e (4)	16m 22s
upload-coverage	8s
	2h 58m 27s

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