[Merged by Bors] - Collect and fetch ATX V2 deps

[poszu]

Description

Adds:

• collecting deps of an ATX V2:
  • previous ATXs
  • positioning ATX
  • marriage ATX (using is still forbidden by syntactical validation though)
  • poet proofs
• registering the IDs of the above objects in the fetcher
• fetching the deps

Test Plan

Added unit tests

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed
• Update changelog as needed

[codecov]

Codecov Report

Attention: Patch coverage is 94.87179% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 80.7%. Comparing base (794aa17) to head (71540cd).
Report is 2 commits behind head on develop.

Files	Patch %	Lines
activation/handler_v2.go	94.8%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5937   +/-   ##
=======================================
  Coverage     80.7%   80.7%           
=======================================
  Files          292     292           
  Lines        30607   30646   +39     
=======================================
+ Hits         24721   24757   +36     
- Misses        4248    4250    +2     
- Partials      1638    1639    +1     

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[poszu]

bors merge

[spacemesh-bors]

Build failed:

• ci-status

[poszu]

Bors merge

[spacemesh-bors]

Build failed (retrying...):

• systest-status

[spacemesh-bors]

Pull request successfully merged into develop.

Build succeeded:

• ci-status
• systest-status