feat: add event

[aeneasr]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #3524 (1e1c635) into master (4c34c24) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 1e1c635 differs from pull request most recent head ab71465. Consider uploading reports for the commit ab71465 to get more accurate results

@@            Coverage Diff             @@
##           master    #3524      +/-   ##
==========================================
+ Coverage   78.34%   78.36%   +0.01%     
==========================================
  Files         341      341              
  Lines       22691    22701      +10     
==========================================
+ Hits        17777    17789      +12     
+ Misses       3586     3585       -1     
+ Partials     1328     1327       -1     

Files Changed	Coverage Δ
session/manager_http.go	79.47% <100.00%> (+0.10%)	⬆️
x/events/events.go	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes