enhance: support templates for expression in Restful api(#38040)

[smellthemoon]

pr: #38040
issue: #36672

[codecov]

Codecov Report

Attention: Patch coverage is 87.17949% with 20 lines in your changes missing coverage. Please review.

Project coverage is 70.43%. Comparing base (dca779d) to head (adefe1c).
Report is 15 commits behind head on 2.4.

Files with missing lines	Patch %	Lines
internal/distributed/proxy/httpserver/utils.go	86.57%	19 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              2.4   #38161       +/-   ##
===========================================
- Coverage   83.58%   70.43%   -13.16%     
===========================================
  Files         805     1073      +268     
  Lines      141188   167806    +26618     
===========================================
+ Hits       118018   118199      +181     
- Misses      18724    45172    +26448     
+ Partials     4446     4435       -11     

Files with missing lines	Coverage Δ
...nternal/distributed/proxy/httpserver/handler_v2.go	91.98% <100.00%> (+0.01%)	⬆️
...nternal/distributed/proxy/httpserver/request_v2.go	97.33% <ø> (ø)
internal/distributed/proxy/httpserver/utils.go	85.99% <86.57%> (+0.07%)	⬆️

... and 300 files with indirect coverage changes

[xiaocai2333]

/lgtm

[congqixia]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, smellthemoon

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• internal/distributed/OWNERS [congqixia]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment