GRPC metric

[gaius-qi]

Description

• Refactor grpc server.
• Add scheduler grpc metrics.
• Add cdn grpc metrics.

Related Issue

Fixes #658

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:

• Code compiles correctly.
• My code follows the code style of this project.
• 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.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #686 (b102777) into main (3589f65) will decrease coverage by 0.03%.
The diff coverage is 9.09%.

@@            Coverage Diff             @@
##             main     #686      +/-   ##
==========================================
- Coverage   38.63%   38.60%   -0.04%     
==========================================
  Files          89       89              
  Lines        6975     6968       -7     
==========================================
- Hits         2695     2690       -5     
+ Misses       3897     3896       -1     
+ Partials      383      382       -1     

Flag	Coverage Δ
Object-compatibility-e2etests	?
unittests	38.60% <9.09%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
cdn/rpcserver/rpcserver.go	0.00% <0.00%> (-0.67%)	⬇️
client/daemon/daemon.go	0.00% <0.00%> (ø)
client/daemon/rpcserver/rpcserver.go	34.28% <0.00%> (ø)
manager/config/config.go	0.00% <ø> (ø)
scheduler/config/config.go	4.59% <ø> (ø)
cdn/supervisor/cdn/manager.go	61.40% <33.33%> (ø)
client/daemon/peer/peertask_stream.go	55.66% <0.00%> (-2.27%)	⬇️
client/daemon/peer/peertask_base.go	35.14% <0.00%> (+0.62%)	⬆️