runtime/common/quantity: Add Mul/Div implementations

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #3744 (2d16e41) into master (a1a7ae6) will decrease coverage by 0.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3744      +/-   ##
==========================================
- Coverage   67.12%   66.81%   -0.31%     
==========================================
  Files         401      401              
  Lines       39898    39898              
==========================================
- Hits        26781    26658     -123     
- Misses       9348     9442      +94     
- Partials     3769     3798      +29     

Impacted Files	Coverage Δ
go/runtime/host/sandbox/sandbox.go	69.53% <0.00%> (-10.55%)	⬇️
go/common/sgx/aesm/aesm.go	62.61% <0.00%> (-8.42%)	⬇️
go/consensus/tendermint/apps/beacon/state/state.go	70.49% <0.00%> (-6.56%)	⬇️
go/common/sgx/common.go	58.53% <0.00%> (-4.88%)	⬇️
go/runtime/host/sgx/sgx.go	69.23% <0.00%> (-4.40%)	⬇️
go/consensus/tendermint/apps/beacon/beacon.go	71.73% <0.00%> (-4.35%)	⬇️
go/consensus/tendermint/full/services.go	80.00% <0.00%> (-4.17%)	⬇️
go/consensus/tendermint/roothash/roothash.go	69.03% <0.00%> (-3.81%)	⬇️
...consensus/tendermint/apps/roothash/transactions.go	66.19% <0.00%> (-2.39%)	⬇️
go/keymanager/client/client.go	79.82% <0.00%> (-1.76%)	⬇️
... and 24 more

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