#4318 forc-crypto plugin exposing a CLI for common-use cryptographi…

…c operations (#5153)

## Description

Fixes #4318

Supported algorithms:
* [x] keccak256
* [x] sha256
* [ ] ~ecrecover~ (this will be added later)
* [x] bech32-to-hex
* [x] hex-to-bech32
* [x] new-key / parse-secret (from
https://github.com/FuelLabs/fuel-core/blob/master/bin/keygen/src/keygen.rs)

## Checklist

- [x] I have linked to any relevant issues.
- [x] I have commented my code, particularly in hard-to-understand
areas.
- [x] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [x] I have added tests that prove my fix is effective or that my
feature works.
- [x] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [x] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [x] I have requested a review from the relevant team or maintainers.

.github/workflows/ci.yml

@@ -115,6 +115,7 @@ jobs:
           cargo install --locked --debug --path ./forc-plugins/forc-client
           cargo install --locked --debug --path ./forc-plugins/forc-doc
           cargo install --locked --debug --path ./forc-plugins/forc-tx
+          cargo install --locked --debug --path ./forc-plugins/forc-crypto
           cargo install --locked --debug forc-explore
       - name: Install mdbook-forc-documenter
         run: cargo install --locked --debug --path ./scripts/mdbook-forc-documenter
@@ -125,7 +126,7 @@ jobs:
           mdbook-version: '0.4.25'
       - name: Emit book logs to tmp.txt, fail if build logs contain 'ERROR'
         run: |
-          MDBOOK_preprocessor__FORC_documenter__STRICT="true" mdbook build docs/book &> tmp.txt
+          MDBOOK_preprocessor__FORC_documenter__STRICT="true" mdbook build docs/book 2>&1 | tee tmp.txt
           if cat tmp.txt | grep 'ERROR'
           then
             cat tmp.txt