Abstract away DB in AtxBuilder

[poszu]

Motivation

Step 1 of the Activation Service PoC #6354

Description

Abstract away accesses to the state DB in the ATX builder by using a AtxService interface, which provides access to:

• the last ATX of the identity,
• a fresh positioning ATX,
• any ATX requested by ATXID.

Blobs of the built ATXs are preserved in a new table in the local DB for re-gossipping them later at the re-gossip intervals.

Test Plan

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 88.48485% with 19 lines in your changes missing coverage. Please review.

Project coverage is 79.7%. Comparing base (fa5c830) to head (2495652).
Report is 30 commits behind head on node-split-poc.

Files with missing lines	Patch %	Lines
activation/atx_service_db.go	82.2%	10 Missing and 4 partials ⚠️
activation/activation.go	87.8%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           node-split-poc   #6356     +/-   ##
================================================
- Coverage            81.5%   79.7%   -1.9%     
================================================
  Files                 330     330             
  Lines               36368   43031   +6663     
================================================
+ Hits                29664   34311   +4647     
- Misses               4769    6774   +2005     
- Partials             1935    1946     +11     

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