Checked arithmetic in multitoken vp #7103

Job	Run time
namada-release (ubuntu-latest, 2.4.0, ABCI Release build)	12m 18s
build-wasm (ubuntu-latest, v2, 2.4.0)	5m 56s
test-integration (ubuntu-latest, nightly-2023-06-01, 2.4.0, ABCI)	6m 54s
test-unit (ubuntu-latest, nightly-2023-06-01, 2.4.0, ABCI)	18m 58s
upload-wasm (ubuntu-latest, v2, nightly-2023-06-01, 2.4.0)	17s
test-wasm (ubuntu-latest, v2, nightly-2023-06-01, 2.4.0)	8m 32s
run-benchmarks (ubuntu-latest, nightly-2023-06-01, 2.4.0, ABCI)	30m 12s
namada-e2e (ubuntu-latest, nightly-2023-06-01, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 0)	16m 37s
namada-e2e (ubuntu-latest, nightly-2023-06-01, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 1)	18m 15s
namada-e2e (ubuntu-latest, nightly-2023-06-01, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 2)	18m 36s
namada-e2e (ubuntu-latest, nightly-2023-06-01, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 3)	17m 23s
	2h 33m 58s

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