feat: add register_actions

[tlambert03]

No description provided.

[codecov]

Codecov Report

Merging #45 (06962fb) into main (0804b95) will decrease coverage by 0.28%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   96.34%   96.05%   -0.29%     
==========================================
  Files          32       32              
  Lines        1668     1674       +6     
==========================================
+ Hits         1607     1608       +1     
- Misses         61       66       +5     

Impacted Files	Coverage Δ
src/app_model/_app.py	87.69% <28.57%> (-7.23%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0804b95...06962fb. Read the comment docs.