Feat: add chat-gpt step and its example

[FogDong]

Description of your changes

Feat: add chat-gpt step and its example

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 has no change and project coverage change: +44.11 🎉

Comparison is base (a4f3ec8) 22.77% compared to head (25ff0bb) 66.88%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #156       +/-   ##
===========================================
+ Coverage   22.77%   66.88%   +44.11%     
===========================================
  Files          48       50        +2     
  Lines        4294     4551      +257     
===========================================
+ Hits          978     3044     +2066     
+ Misses       3100     1104     -1996     
- Partials      216      403      +187     

Flag	Coverage Δ
e2etests	22.15% <ø> (-0.63%)	⬇️
unit-test	64.36% <ø> (?)

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see 42 files with indirect coverage changes

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