Move common classes related to theme into api module (#3686)

#### What type of PR is this?

/kind cleanup
/area core

#### What this PR does / why we need it:

Move common classes related to theme into api module.

#### Does this PR introduce a user-facing change?

```release-note
None
```
pull/3687/head
John Niang 2023-04-03 16:06:13 +08:00 committed by GitHub
parent a2516dbef4
commit 0973c64ad2
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