Enable Lint check

[ljubon]

Checklist before submitting

• Did you read the contributing guide?
• Did you update the docs?
• Did you write any tests to validate this change?

Description

The goal of this change is to enable linting as required check for the CI
example run: https://github.com/ljubon/spark-dgraph-connector/actions/runs/6946230885/job/18897234201

Resolves https://github.com/G-Research/oss-portfolio-maturity/issues/369.

Review process for approval

1. All tests and other checks must succeed.
2. At least one core contributors must review and approve.
3. If a core contributor requests changes, they must be addressed.

[EnricoMi]

I'd prefer to do this the same way we did in G-Research/spark-extension#201 and G-Research/spark-extension#212.

[github-actions]

Test Results

 2 753 files   -   243   2 753 suites   - 243   49m 41s ⏱️ - 2m 17s
   486 tests ±    0     485 ✅ ±    0   1 💤 ±0  0 ❌ ±0 
39 807 runs   - 3 277  39 719 ✅  - 3 269  88 💤  - 8  0 ❌ ±0 

Results for commit f259d93. ± Comparison against base commit 09dacbf.

♻️ This comment has been updated with latest results.

[ljubon]

I'd prefer to do this the same way we did in G-Research/spark-extension#201 and G-Research/spark-extension#212.

In latest commit, i've applied changes from suggested PRs/commits:

• https://github.com/G-Research/spark-extension/pull/212/files
• G-Research/spark-extension@0e634c2

p.s format is not applied, so it's expected that action Linting is failing - let me know if you want me to commit to this PR formated code which will affect the files in src/

[EnricoMi]

let me know if you want me to commit to this PR formated code which will affect the files in src/

applied in #264

[EnricoMi]

LGTM!