fix: Change cosmos.ics23.v1.serde mod to no-std.

[riversyang]

Motivation

During the integration of ibc-rs v0.41.0 (which uses ics23 v0.10.1) into near-ibc, I encountered compile errors in the cosmos.ics23.v1.serde module of ics23. The module was using several std types that are not allowed in NEAR smart contracts.

To resolve this, I made the necessary changes to allow compilation. I believe it would be beneficial to also commit these changes to the original repository.

All Changes

• Replace std in cosmos.ics23.v1.serde to core.
• Add use for format macro and Vec of alloc in cosmos.ics23.v1.serde.

[codecov]

Codecov Report

Patch coverage: 44.34% and project coverage change: +16.57 🎉

Comparison is base (d0edf8e) 48.76% compared to head (c2b34d2) 65.33%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #154       +/-   ##
===========================================
+ Coverage   48.76%   65.33%   +16.57%     
===========================================
  Files          24        8       -16     
  Lines        9903     3551     -6352     
  Branches       86        0       -86     
===========================================
- Hits         4829     2320     -2509     
+ Misses       4717     1231     -3486     
+ Partials      357        0      -357     

Flag	Coverage Δ
go	?
rust	65.33% <44.34%> (+0.05%)	⬆️
typescript	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rust/src/cosmos.ics23.v1.serde.rs	40.43% <44.34%> (+0.10%)	⬆️

... and 16 files with indirect coverage changes

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[romac]

Superseded by #158