[#13004] Add Timestamp to Tag list API

[lucasqueiroz]

Description

This Pull Request aims to solve the problem described on #13004, adding a timestamp to the tag list API.
As this is my first time writing Go code, please let me know if there's anything that could be improved.
I did not find any unit tests for the changed object.

Results

When running the API locally, the swagger docs result in this:

And the API returns the following information:

[codecov-commenter]

Codecov Report

Merging #13026 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #13026      +/-   ##
==========================================
- Coverage   42.55%   42.54%   -0.01%     
==========================================
  Files         672      672              
  Lines       73715    73716       +1     
==========================================
- Hits        31367    31361       -6     
- Misses      37264    37272       +8     
+ Partials     5084     5083       -1     

Impacted Files	Coverage Δ
modules/convert/git_commit.go	88.39% <100.00%> (+0.10%)	⬆️
modules/indexer/stats/db.go	52.17% <0.00%> (-8.70%)	⬇️
services/pull/check.go	44.61% <0.00%> (-3.85%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
routers/repo/view.go	37.47% <0.00%> (-0.65%)	⬇️
models/error.go	34.34% <0.00%> (-0.51%)	⬇️
services/pull/pull.go	41.27% <0.00%> (+0.49%)	⬆️
modules/queue/unique_queue_disk_channel.go	55.38% <0.00%> (+1.53%)	⬆️
modules/log/event.go	59.43% <0.00%> (+1.88%)	⬆️

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[6543]

Pleace add a test :)

[lucasqueiroz]

@6543 I've added unit tests for the ToCommitMeta method, not sure if the approach I took is the best, but I couldn't find any way to load Tags from a loaded bean.
Please let me know if anything can be improved

[6543]

@lucasqueiroz just make fmt :)

[lucasqueiroz]

@lucasqueiroz just make fmt :)

Whoops my bad!