feat: adding positions to certificate

[Freyskeyd]

Description

This PR adds positions to Certificate in GraphQL response.

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[dvdplm]

lgtm

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (4b0ec9b) 67.98% compared to head (91c872f) 68.33%.

Files	Patch %	Lines
crates/topos-tce-api/src/graphql/query.rs	25.00%	3 Missing ⚠️
crates/topos-tce-api/src/runtime/mod.rs	75.00%	2 Missing ⚠️
crates/topos-core/src/api/graphql/certificate.rs	87.50%	1 Missing ⚠️
crates/topos-tce-api/src/runtime/sync_task.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #440      +/-   ##
==========================================
+ Coverage   67.98%   68.33%   +0.34%     
==========================================
  Files         224      224              
  Lines       13129    13152      +23     
==========================================
+ Hits         8926     8987      +61     
+ Misses       4203     4165      -38     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.