add timestamp to ethr builder

[insipx]

related to xmtp/xps-gateway#61

timestamp is not the best way b/c we can have multiple installation id updates in the same block. It may be OK in the general case, since it could be rare that a user updates their installation key in the same block twice, but it can happen. libxmtp relies on it in order to sort through installation ids it already has. In the future it would be better to use a block # / log index combo. This would also avoid yet another api call to the ethereum rpc node

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (c7f7452) 97.27% compared to head (77f5c5a) 97.25%.

Files	Patch %	Lines
lib/src/types/ethr.rs	97.97%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   97.27%   97.25%   -0.02%     
==========================================
  Files          13       13              
  Lines        2826     2953     +127     
==========================================
+ Hits         2749     2872     +123     
- Misses         77       81       +4     

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[37ng]

LGTM!
Looks like we need a rustfmt.toml to unify cargo fmt

[insipx]

LGTM! Looks like we need a rustfmt.toml to unify cargo fmt

we should be just on the stable default rustfmt settings, in this case my lsp crashed and i didn't get the autoformatting I usually do

[jac18281828]

I think we should be consistent in our use of block timestamp in seconds

[insipx]

removed logic to convert to datetime b/c it was wasteful, changed to store the usual timestamp and then multiply for nanoseconds @jac18281828

[jac18281828]

Looks good ! One last thing, I’d use Duration for time conversion.