feat: add metrics to service v2

[gaius-qi]

Description

• Add metrics to service v2.

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[hyy0322]

lgtm

[codecov]

Codecov Report

Merging #2153 (01736e5) into main (cddcac7) will increase coverage by 0.08%.
The diff coverage is 58.98%.

@@            Coverage Diff             @@
##             main    #2153      +/-   ##
==========================================
+ Coverage   47.84%   47.93%   +0.08%     
==========================================
  Files         141      141              
  Lines       19493    19640     +147     
==========================================
+ Hits         9327     9415      +88     
- Misses       9577     9634      +57     
- Partials      589      591       +2     

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	47.93% <58.98%> (+0.08%)	⬆️

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

Impacted Files	Coverage Δ
manager/rpcserver/manager_server_v1.go	0.00% <0.00%> (ø)
manager/rpcserver/manager_server_v2.go	0.00% <0.00%> (ø)
scheduler/resource/seed_peer.go	20.86% <0.00%> (-0.16%)	⬇️
scheduler/rpcserver/scheduler_server_v1.go	2.46% <0.00%> (-0.87%)	⬇️
scheduler/rpcserver/scheduler_server_v2.go	2.56% <0.00%> (-0.77%)	⬇️
scheduler/service/service_v1.go	79.36% <71.42%> (-0.15%)	⬇️
scheduler/service/service_v2.go	83.63% <84.11%> (-0.04%)	⬇️

... and 1 file with indirect coverage changes

[hyy0322]

lgtm