[Merged by Bors] - Use zap in checkpoint package

[poszu]

Motivation

Continue migration from our log implementation to zap.

Description

Migrate the checkpoint package to zap.

Test Plan

n/a

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 92.30769% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.4%. Comparing base (1be211b) to head (964ff14).

Files	Patch %	Lines
checkpoint/recovery.go	94.7%	2 Missing ⚠️
node/node.go	0.0%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #6063     +/-   ##
=========================================
- Coverage     81.4%   81.4%   -0.1%     
=========================================
  Files          299     299             
  Lines        32171   32149     -22     
=========================================
- Hits         26212   26193     -19     
+ Misses        4247    4245      -2     
+ Partials      1712    1711      -1     

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[poszu]

bors merge

[spacemesh-bors]

Build failed (retrying...):

• systest-status

[spacemesh-bors]

Pull request successfully merged into develop.

Build succeeded:

• ci-status
• systest-status