feat(nano): Add salt to tokens created by contracts

[msbrogli]

Motivation

Add a salt to the token creation by contracts. This change allows contracts to create multiple tokens with the same token symbol and was requested by a use case.

Acceptance Criteria

1. Add salt: bytes as an optional attribute when creating a token using self.syscall.create_token(...). Default is no salt.
2. Add salt: bytes as an optional attribute in derive_child_token_id(). Default is no salt.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	feat/token-creation-salt
Testbed	ubuntu-22.04

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Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.84 m (+9.05%) Baseline: 1.68 m	1.52 m (82.53%)	2.02 m (90.87%)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.94%. Comparing base (ec34dfe) to head (1c51c26).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1398      +/-   ##
==========================================
+ Coverage   85.88%   85.94%   +0.05%     
==========================================
  Files         432      432              
  Lines       32745    32746       +1     
  Branches     5102     5102              
==========================================
+ Hits        28122    28142      +20     
+ Misses       3603     3591      -12     
+ Partials     1020     1013       -7     

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