build optimizations

[greg-szabo]

Small step toward #723 .

Introduces a few new cargo commands so that developers and the CI can easily run the same commands.

• cargo build-all == cargo build --workspace --all-targets
• cargo build-wasm-tendermint == (build tendermint with the wasm32-unknown-unknown target)
• cargo build-wasm-light-client == (build tendermint-light-client with the wasm32-unknown-unknown target)

This is a small example of how building and testing can be simplified between the developer and the CI. Further cases will come as I research the tools mentioned in #723.

Edit: it would be nice to have a simple cargo build-wasm command, but currently it's not possible, because the --no-default-features parameter cannot run in a virtual workspace, hence we need to add the --manifest-path parameter to point to the specific package's Cargo.toml as well as the --package parameter (describing the crate name) to point to the package that should be built.

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Updated CHANGELOG.md

[codecov-io]

Codecov Report

Merging #725 (ff2ebc8) into master (1892b69) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #725   +/-   ##
======================================
  Coverage    42.5%   42.5%           
======================================
  Files         202     202           
  Lines       12904   12904           
  Branches     3298    3298           
======================================
  Hits         5496    5496           
  Misses       7058    7058           
  Partials      350     350           

Impacted Files	Coverage Δ
light-client/src/macros.rs	11.1% <0.0%> (ø)

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