Implement credits payment method

[nesitor]

Feature: Implement credits payment method monitoring, same behaviour as PAYG but with credits.

Related ClickUp, GitHub or Jira tickets : ALEPH-615

Self proofreading checklist

• The new code clear, easy to read and well commented.
• New code does not duplicate the functions of builtin or popular libraries.
• An LLM was used to review the new code and look for simplifications.
• New classes and functions contain docstrings explaining what they provide.
• All new code is covered by relevant tests.
• Documentation has been updated regarding these changes.
• Dependencies update in the project.toml have been mirrored in the Debian package build script packaging/Makefile

Changes

Added credit payment method on balance monitoring task. Also added needed methods to query the API for credit balance based on address.

How to test

Create an intance using credits payment method and remove the credits, the instance should be stopped.

[codecov]

Codecov Report

❌ Patch coverage is 34.54545% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.47%. Comparing base (05a9072) to head (3e3351f).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aleph/vm/orchestrator/tasks.py	21.73%	16 Missing and 2 partials ⚠️
src/aleph/vm/orchestrator/payment.py	20.00%	16 Missing ⚠️
src/aleph/vm/orchestrator/views/__init__.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #830      +/-   ##
==========================================
- Coverage   64.61%   64.47%   -0.14%     
==========================================
  Files          87       87              
  Lines        8048     8063      +15     
  Branches      722      727       +5     
==========================================
- Hits         5200     5199       -1     
- Misses       2621     2637      +16     
  Partials      227      227              

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