Feat: Add Terms & Conditions

[philogicae]

Jira Tasks:

• ALEPH-325: Require users to sign T&C on Aleph Client CLI
• ALEPH-327: Show T&C accepted on VMs in Aleph Client CLI

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.

Changes

Add Terms & conditions feature

How to test

Create an instance on a T&C CRN, then display your instance list

TODO

• Tests after nodestatus update
• Rebase after Fix: Various improvements (UX, edge cases, coverage) #312 is merged

[codecov]

Codecov Report

Attention: Patch coverage is 61.90476% with 16 lines in your changes missing coverage. Please review.

Project coverage is 54.61%. Comparing base (575c7bf) to head (bed45d7).

Files with missing lines	Patch %	Lines
src/aleph_client/commands/instance/__init__.py	36.36%	4 Missing and 3 partials ⚠️
src/aleph_client/models.py	68.18%	3 Missing and 4 partials ⚠️
src/aleph_client/commands/instance/display.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##           fix-various-improvements     #311      +/-   ##
============================================================
+ Coverage                     54.47%   54.61%   +0.14%     
============================================================
  Files                            18       18              
  Lines                          2537     2578      +41     
  Branches                        320      328       +8     
============================================================
+ Hits                           1382     1408      +26     
- Misses                          993     1002       +9     
- Partials                        162      168       +6     

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[olethanh]

Some general comments/nitpicks from reading the code. I haven't tested it yet.