[new feature] Loading: add circular type

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #618 into dev will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #618      +/-   ##
==========================================
- Coverage   90.83%   90.78%   -0.06%     
==========================================
  Files          97       97              
  Lines        1866     1866              
  Branches      289      289              
==========================================
- Hits         1695     1694       -1     
- Misses         84       85       +1     
  Partials       87       87

Impacted Files	Coverage Δ
packages/loading/index.vue	50% <ø> (ø)	⬆️
packages/utils/scroll.js	88.57% <0%> (-2.86%)	⬇️

---

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 6e00eda...354957e. Read the comment docs.