feat(nano): implement new get_current_code_blueprint_id syscall

[glevco]

Motivation

This is a 2-in-1 PR:

• It fixes an issue where making a double proxy call would bypass the BlueprintId validation, meaning a contract would be able to call a method on itself when it should fail with NCInvalidSyscall('cannot call the same blueprint') instead. This is not a security problem, but rather a minor inconvenience as we could help developers prevent such mistakes.
• Introduce a new get_current_code_blueprint_id syscall to get the BlueprintId of the currently running code instead of currently running contract. The same method is used to fix the issue above.

Acceptance Criteria

• Implement new get_current_code_blueprint_id syscall.
• Fix BlueprintId validation when making double proxy calls.

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.05%. Comparing base (e69ca48) to head (a10ddb8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1471      +/-   ##
==========================================
- Coverage   86.14%   86.05%   -0.09%     
==========================================
  Files         437      437              
  Lines       34037    34044       +7     
  Branches     5323     5324       +1     
==========================================
- Hits        29321    29298      -23     
- Misses       3673     3694      +21     
- Partials     1043     1052       +9     

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