[Umbrella] Good First Issues

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

### Search before asking

- [X] I have searched in the [issues](https://github.com/apache/incubator-uniffle/issues) and found no similar issues.

### Describe the proposal

These issues are a great way to get started with a project. Any contribution is important for the Uniffle Commuinity. If the issues have been assigned to others, but there isn't any progress for more than 3 months. You can ask committers or collaborators to assign it to you, too.
The steps of contribution is as below: https://github.com/apache/incubator-uniffle/blob/master/CONTRIBUTING.md

### Task list

Code Style Improvements
If you don't read the code of Uniffle but you have some experience about Java. These issues are suitable for you.
- [x] https://github.com/apache/incubator-uniffle/issues/851
- [x] https://github.com/apache/incubator-uniffle/issues/363
- [x] https://github.com/apache/incubator-uniffle/issues/532

Simple Tasks
If you don't realize the code of Uniffle and want to realize this project by some tasks. These issues are suitable for you.
- [ ] https://github.com/apache/incubator-uniffle/issues/1020
- [x] https://github.com/apache/incubator-uniffle/issues/974
- [x] https://github.com/apache/incubator-uniffle/issues/460
- [x] https://github.com/apache/incubator-uniffle/issues/333
- [ ] https://github.com/apache/incubator-uniffle/issues/138
- [ ] https://github.com/apache/incubator-uniffle/issues/313
- [x] https://github.com/apache/incubator-uniffle/issues/1119
- [x] https://github.com/apache/incubator-uniffle/issues/1108
- [x] https://github.com/apache/incubator-uniffle/issues/1157

CI Improvement
If you're not familiar about Uniffle but have some experience about Github Actions. These issues are suitable for you.
- [ ] https://github.com/apache/incubator-uniffle/issues/1096

Documents
If you don't have much experience about Java and Uniffle but want to contribute to this project. You can try to improve the documents of this project.
- [x] https://github.com/apache/incubator-uniffle/issues/1094

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

Start with CONTRIBUTING.md and review the unchecked linked issues (#1020, #138, #313, and #1096) to determine which tasks remain actionable. Done means the relevant work is completed and this umbrella checklist accurately reflects the available good-first-issue tasks.

Written by the indexing model from the issue text.