Chore: refactor the cue engine with cuex

[FogDong]

Description of your changes

Chore: refactor the cue engine with cuex

TODO:

• refactor config provider and add it to cuex.

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

Attention: Patch coverage is 71.34220% with 237 lines in your changes missing coverage. Please review.

Project coverage is 67.78%. Comparing base (c3331e7) to head (ce912dc).

Files	Patch %	Lines
pkg/providers/legacy/metrics/prom_check.go	38.04%	51 Missing and 6 partials ⚠️
pkg/providers/legacy/kube/kube.go	62.23%	32 Missing and 22 partials ⚠️
pkg/cue/model/value/value.go	53.65%	17 Missing and 2 partials ⚠️
pkg/providers/legacy/http/http.go	79.12%	10 Missing and 9 partials ⚠️
pkg/tasks/custom/action.go	70.31%	18 Missing and 1 partial ⚠️
pkg/providers/legacy/workspace/workspace.go	74.64%	10 Missing and 8 partials ⚠️
pkg/providers/legacy/util/util.go	76.66%	7 Missing and 7 partials ⚠️
pkg/context/context.go	65.21%	3 Missing and 5 partials ⚠️
pkg/executor/workflow.go	60.00%	3 Missing and 3 partials ⚠️
pkg/providers/types/types.go	81.25%	4 Missing and 2 partials ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   63.44%   67.78%   +4.33%     
==========================================
  Files          51       55       +4     
  Lines        4604     3858     -746     
==========================================
- Hits         2921     2615     -306     
+ Misses       1282      952     -330     
+ Partials      401      291     -110     

Flag	Coverage Δ
e2etests	21.80% <19.58%> (?)
unit-test	62.83% <64.57%> (-0.62%)	⬇️

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[Somefive]

Great job! Generally LGTM. Let's make a sync PR in the kubevela/kubevela and see if it works.