feat(nano): add str utils for Address class

[jansegre]

Motivation

Currently there isn't a way to convert to/from string and addresses in Blueprint code. Instead of simply exposing the internal functions to do it, this PR exposes a friendlier API.

Acceptance Criteria

• add str(address) support for address: Address
• add Address.from_str(raw_address)

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/nano/str-address-utils
Testbed	ubuntu-22.04

Click to view all benchmark results

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	1.86 m (+10.76%) Baseline: 1.68 m	1.51 m (81.26%)	2.02 m (92.30%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.86%. Comparing base (12464d2) to head (bf7b5c2).

Files with missing lines	Patch %	Lines
hathor/nanocontracts/types.py	72.72%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1391      +/-   ##
==========================================
- Coverage   85.91%   85.86%   -0.05%     
==========================================
  Files         430      430              
  Lines       32570    32583      +13     
  Branches     5072     5074       +2     
==========================================
- Hits        27981    27979       -2     
- Misses       3575     3587      +12     
- Partials     1014     1017       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.