Add types for one-value params and returns

[alexytsu]

#817

[codecov-commenter]

Codecov Report

Merging #1242 (bab3a04) into master (9cb8a6b) will decrease coverage by 0.02%.
The diff coverage is 80.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1242      +/-   ##
==========================================
- Coverage   90.97%   90.96%   -0.02%     
==========================================
  Files         133      133              
  Lines       26633    26697      +64     
==========================================
+ Hits        24230    24284      +54     
- Misses       2403     2413      +10     

Impacted Files	Coverage Δ
actors/evm/src/types.rs	62.50% <40.00%> (-37.50%)	⬇️
actors/datacap/src/lib.rs	77.03% <40.90%> (-2.26%)	⬇️
actors/datacap/src/types.rs	69.23% <60.00%> (-30.77%)	⬇️
actors/evm/src/lib.rs	93.12% <96.55%> (+0.41%)	⬆️
actors/account/src/lib.rs	90.00% <100.00%> (+0.52%)	⬆️
actors/account/src/types.rs	100.00% <100.00%> (ø)
actors/market/src/lib.rs	91.13% <100.00%> (ø)
actors/market/src/types.rs	96.77% <100.00%> (+0.22%)	⬆️
actors/miner/src/lib.rs	83.24% <100.00%> (+0.01%)	⬆️
actors/miner/src/types.rs	95.89% <100.00%> (+0.05%)	⬆️
... and 6 more

... and 3 files with indirect coverage changes

[anorth]

Great. I would like someone else to check the EVM actors, but thank you.

As an aside, it could be nice to implement a constructor-generating macro like https://jeltef.github.io/derive_more/derive_more/constructor.html so we could token.balance_of(&params.address).map(BalanceReturn::new). But don't hold up this PR for it, and I would do something simple here rather than add a dependency.

[anorth]

Could you add an issue in https://github.com/helix-onchain/filecoin to move these types there?

[alexytsu]

filecoin-project/actors-utils#206

[anorth]

@Stebalien could you review just the EVM actors for a second set of eyes please?

[Stebalien]

one fix but the EVM logic otherwise looks correct.

[anorth]

@alexytsu ready for merge? Please do so after rebasing.