Tests

feat: codec traits impl for `i128` (#685) #1468

Job	Run time
no-std build	39s
Unix tests (ubuntu-latest, stable)	2m 30s
Unix tests (ubuntu-latest, nightly)	1m 57s
WASM tests	4m 3s
Unix tests (macos-13, stable)	3m 28s
Unix tests (macos-13, nightly)	4m 20s
Unix tests (macos-14, stable)	2m 27s
Windows tests (stable, x86_64-pc-windows-gnu)	4m 43s
Unix tests (macos-14, nightly)	1m 47s
Windows tests (stable, x86_64-pc-windows-msvc)	5m 20s
Windows tests (nightly, x86_64-pc-windows-gnu)	4m 29s
Windows tests (nightly, x86_64-pc-windows-msvc)	4m 42s
	40m 25s

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