Add verify scripts for various checks

[yuanchen8911]

Add verification and check scripts: gofmt, golint, spelling check, yaml format, ...
hack/verifiy-all or make verify will perform all checks.
hack/update-all or make update will correct all the issues.

[dmitsh]

isn't it an overkill?

[yuanchen8911]

isn't it an overkill?

I removed the directory venv which contains a large number of files. We just need the verify and uddatel scripts in the hack folder: a total of 10 checks only.

I think these scripts are quite useful. Running hack/verify-all.sh has identified a few issues in the current code and docs though most of them are minor.

@dmitsh, can you take another look?

[yuanchen8911]

/retest

[shinae-woo]

I have one issue on yaml format, which I can ignore.

shinaew@shinae-sjc-desktop:~/src/knavigator$ make update
[*] Update go format...
Update go format
[*] Update go mod...
[*] Update go lint...
[*] Update ends newline...
[*] Update shell format...
Update shell format
[*] Update yaml format...
Update yaml format
2024/05/10 12:34:43 encountered the following formatting errors:
./charts/virtual-nodes/templates/nodes.yaml: yaml: line 3: did not find expected alphabetic or numeric character
exit status 1
[*] Update spelling...
Update failed for: yaml-format
make: *** [Makefile:33: update] Error 1

And two new lines at end of file

diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 86f894f..134ab8d 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -60,4 +60,4 @@ jobs:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
\ No newline at end of file
+          labels: ${{ steps.meta.outputs.labels }}
diff --git a/docs/task_management.md b/docs/task_management.md
index fb84593..d24157f 100644
--- a/docs/task_management.md
+++ b/docs/task_management.md
@@ -8,4 +8,4 @@ Tasks are defined in a YAML format or received via HTTP/gRPC protocols. The Task
 - Check the spec and status of nodes
 - Check the spec and status of pods
 - Run PromQL query
-- Sleep for a specified duration
\ No newline at end of file
+- Sleep for a specified duration

[shinae-woo]

LGTM other than issues I reported on above comments

[yuanchen8911]

LGTM other than issues I reported on above comments

Thanks! Not sure how to fix the first one. #28 should fix the empty line issues.