Add CI check on no_std compliance for supported tendermint crates

[soareschen]

The crates tendermint, tendermint-proto, and tendermint-light-client-verifier are now fully no_std compliance with no further changes needed. This PR adds CI check to the respective crates, so that we do not accidentally break no_std support again.

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Added entry in .changelog/

[codecov-commenter]

Codecov Report

Merging #1087 (683c44c) into v0.23.x (cad594d) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           v0.23.x   #1087     +/-   ##
=========================================
- Coverage     67.4%   67.3%   -0.1%     
=========================================
  Files          212     212             
  Lines        20192   20201      +9     
=========================================
+ Hits         13610   13614      +4     
- Misses        6582    6587      +5     

Impacted Files	Coverage Δ
rpc/src/client/transport/router.rs	73.8% <0.0%> (-0.7%)	⬇️
rpc/src/client/transport/websocket.rs	64.2% <0.0%> (-0.7%)	⬇️
abci/src/application/kvstore.rs	74.8% <0.0%> (-0.5%)	⬇️
tendermint/src/node.rs	63.5% <0.0%> (-0.2%)	⬇️
rpc/src/client/bin/main.rs	0.3% <0.0%> (-0.1%)	⬇️
light-client-verifier/src/types.rs	38.2% <0.0%> (ø)
abci/src/server.rs	9.2% <0.0%> (+0.4%)	⬆️
abci/src/codec.rs	90.1% <0.0%> (+1.2%)	⬆️
tendermint/src/block/commit_sig.rs	80.3% <0.0%> (+1.9%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cad594d...683c44c. Read the comment docs.

[thanethomson]

Excellent, this looks great @soareschen - thanks! 🎉