[cryptography] Introudce Array

[najeal]

Closes: #411

Unify representation of fixed-length bytes and detect malformed bytes on parse.

Future Work: #457

[najeal]

When running the cargo clippy command, you should get these errors:

• error: very complex type used. Consider factoring parts into type definitions
• usage of contains_key followed by insert on a BTreeMap

Not sure how we want to handle the first error.
The second error appeared after the modification of a file but we were already doing the insert this way.

[patrick-ogrady]

Just need to fix the signing tests now!

[patrick-ogrady]

If we don't implement this as part of the Octets trait, we can implement it for other types (like u64)

[patrick-ogrady]

We would've seen a nice benchmark gain if this was previously using Scheme (as it should've been).

[codecov]

Codecov Report

Attention: Patch coverage is 88.02488% with 154 lines in your changes missing coverage. Please review.

Project coverage is 94.15%. Comparing base (cee6569) to head (14a2f75).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
cryptography/src/bls12381/scheme.rs	83.44%	50 Missing ⚠️
cryptography/src/ed25519/scheme.rs	79.87%	33 Missing ⚠️
cryptography/src/secp256r1/scheme.rs	83.87%	30 Missing ⚠️
consensus/src/simplex/actors/voter/actor.rs	78.08%	16 Missing ⚠️
cryptography/src/lib.rs	84.21%	6 Missing ⚠️
cryptography/src/bls12381/primitives/group.rs	0.00%	5 Missing ⚠️
consensus/src/simplex/verifier.rs	85.71%	3 Missing ⚠️
p2p/src/authenticated/config.rs	33.33%	2 Missing ⚠️
p2p/src/simulated/network.rs	91.66%	2 Missing ⚠️
consensus/src/simplex/actors/resolver/actor.rs	80.00%	1 Missing ⚠️
... and 6 more

@@            Coverage Diff             @@
##             main     #447      +/-   ##
==========================================
- Coverage   94.43%   94.15%   -0.28%     
==========================================
  Files          93       94       +1     
  Lines       26611    27403     +792     
==========================================
+ Hits        25129    25802     +673     
- Misses       1482     1601     +119     

Files with missing lines	Coverage Δ
consensus/src/simplex/actors/voter/ingress.rs	100.00% <ø> (ø)
consensus/src/simplex/config.rs	68.75% <ø> (ø)
consensus/src/simplex/encoder.rs	100.00% <100.00%> (ø)
consensus/src/simplex/engine.rs	94.38% <100.00%> (+0.40%)	⬆️
consensus/src/simplex/metrics.rs	100.00% <100.00%> (ø)
consensus/src/simplex/mocks/application.rs	91.18% <100.00%> (ø)
consensus/src/simplex/mocks/conflicter.rs	90.78% <100.00%> (+0.78%)	⬆️
consensus/src/simplex/mocks/nuller.rs	88.09% <100.00%> (+0.91%)	⬆️
consensus/src/simplex/mocks/relay.rs	88.88% <100.00%> (ø)
consensus/src/simplex/mocks/supervisor.rs	95.41% <100.00%> (ø)
... and 58 more

... and 6 files with indirect coverage changes

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