tests(nano): add register_blueprint_file test method

[glevco]

Motivation

When blueprint devs are implementing tests, their blueprints are not verified against code restrictions. This PR adds the register_blueprint_file method which does this and should be used by blueprints devs from now on instead of register_blueprint_class.

Acceptance Criteria

• Change register_blueprint_class test method to _register_blueprint_class, making the blueprint ID optional. It should be used by our internal tests.
• Add new register_blueprint_file test method, which verifies the blueprint code. It should be used by blueprint devs.

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	tests/nano/verify-blueprint
Testbed	ubuntu-22.04

🚨 1 Alert

Benchmark	Measure Units	View	Benchmark Result (Result Δ%)	Upper Boundary (Limit %)
sync-v2 (up to 20000 blocks)	Latency minutes (m)	📈 plot 🚷 threshold 🚨 alert (🔔)	2.22 m (+34.88%) Baseline: 1.64 m	1.81 m (122.62%)

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 🚨 view alert (🔔)	2.22 m (+34.88%) Baseline: 1.64 m	1.48 m (66.72%)	1.81 m (122.62%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.59%. Comparing base (bf25283) to head (8112ca8).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1318      +/-   ##
==========================================
- Coverage   85.65%   85.59%   -0.07%     
==========================================
  Files         426      426              
  Lines       31966    31966              
  Branches     4963     4963              
==========================================
- Hits        27380    27360      -20     
- Misses       3590     3605      +15     
- Partials      996     1001       +5     

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