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 19.73039% with 655 lines in your changes are missing coverage. Please review.

Project coverage is 21.58%. Comparing base (f187b42) to head (45b2929).

Files	Patch %	Lines
pkg/providers/legacy/kube/kube.go	5.59%	135 Missing ⚠️
pkg/providers/legacy/metrics/prom_check.go	3.26%	89 Missing ⚠️
pkg/providers/legacy/http/http.go	4.39%	87 Missing ⚠️
pkg/providers/legacy/workspace/workspace.go	14.08%	61 Missing ⚠️
pkg/providers/legacy/util/util.go	8.33%	55 Missing ⚠️
pkg/tasks/custom/action.go	14.06%	55 Missing ⚠️
pkg/providers/legacy/email/email.go	8.10%	34 Missing ⚠️
pkg/tasks/custom/task.go	36.00%	27 Missing and 5 partials ⚠️
pkg/cue/model/value/value.go	39.02%	24 Missing and 1 partial ⚠️
pkg/providers/legacy/time/time.go	16.66%	20 Missing ⚠️
... and 11 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #162       +/-   ##
===========================================
- Coverage   66.76%   21.58%   -45.19%     
===========================================
  Files          50       52        +2     
  Lines        4553     3572      -981     
===========================================
- Hits         3040      771     -2269     
- Misses       1108     2644     +1536     
+ Partials      405      157      -248     

Flag	Coverage Δ
e2etests	21.58% <19.73%> (-0.56%)	⬇️
unit-test	?

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[Somefive]

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