SUBMARINE-658. Rename publick-api.ts to public-api.ts

### What is this PR for?
A few sentences describing the overall goals of the pull request's commits.
First time? Check out the contributing guide - https://submarine.apache.org/contribution/contributions.html

### What type of PR is it?
[Refactoring]

### Todos
* [ ] - Task

### What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-658

### How should this be tested?
* First time? Setup Travis CI as described on https://submarine.apache.org/contribution/contributions.html#continuous-integration
* Strongly recommended: add automated unit tests for any new or changed behavior
* Outline any manual steps to test the PR here.

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No

Author: Hsuan Lee <hsuangm@gmail.com>

Closes #434 from hsuanxyz/SUBMARINE-658 and squashes the following commits:

ec49886 [Hsuan Lee] SUBMARINE-658. Rename publick-api.ts to public-api.ts
diff --git a/submarine-workbench/workbench-web/src/app/core/index.ts b/submarine-workbench/workbench-web/src/app/core/index.ts
index 30631d0..630627e 100644
--- a/submarine-workbench/workbench-web/src/app/core/index.ts
+++ b/submarine-workbench/workbench-web/src/app/core/index.ts
@@ -17,4 +17,4 @@
  * under the License.
  */
 
-export * from './publick-api';
+export * from './public-api';
diff --git a/submarine-workbench/workbench-web/src/app/core/publick-api.ts b/submarine-workbench/workbench-web/src/app/core/public-api.ts
similarity index 100%
rename from submarine-workbench/workbench-web/src/app/core/publick-api.ts
rename to submarine-workbench/workbench-web/src/app/core/public-api.ts