Feat: prometheus check steps provider

[wangyikewxgm]

prometheus check steps provider.

Description of your changes

Fixes #

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage: 35.92% and project coverage change: -1.30 ⚠️

Comparison is base (edc7849) 67.97% compared to head (c79977e) 66.68%.

❗ Current head c79977e differs from pull request most recent head ed5dbf2. Consider uploading reports for the commit ed5dbf2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
- Coverage   67.97%   66.68%   -1.30%     
==========================================
  Files          48       49       +1     
  Lines        4334     4505     +171     
==========================================
+ Hits         2946     3004      +58     
- Misses       1022     1099      +77     
- Partials      366      402      +36     

Flag	Coverage Δ
e2etests	21.80% <4.85%> (-3.26%)	⬇️
unit-test	64.42% <32.03%> (-0.50%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/providers/metrics/prom_check.go	35.29% <35.29%> (ø)
pkg/generator/generator.go	68.80% <100.00%> (+0.25%)	⬆️

... and 16 files with indirect coverage changes

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