feat: implement v2 version of scheduler service

[gaius-qi]

Description

• Implement StatTask, AnnounceHost and LeaveHost api in scheduler 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.

[codecov]

Codecov Report

Merging #2125 (c0a11ef) into main (de2a7c9) will increase coverage by 2.45%.
The diff coverage is 81.09%.

@@            Coverage Diff             @@
##             main    #2125      +/-   ##
==========================================
+ Coverage   42.28%   44.74%   +2.45%     
==========================================
  Files         141      141              
  Lines       18666    18907     +241     
==========================================
+ Hits         7893     8459     +566     
+ Misses      10198     9873     -325     
  Partials      575      575              

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	44.74% <81.09%> (+2.45%)	⬆️

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

Impacted Files	Coverage Δ
client/daemon/peer/piece_manager_mock.go	0.00% <0.00%> (ø)
scheduler/resource/seed_peer_mock.go	0.00% <0.00%> (ø)
scheduler/rpcserver/scheduler_server_v1.go	3.33% <0.00%> (-0.06%)	⬇️
scheduler/rpcserver/scheduler_server_v2.go	3.63% <0.00%> (-2.82%)	⬇️
client/daemon/peer/peertask_manager_mock.go	36.81% <25.00%> (ø)
scheduler/service/service_v2.go	96.04% <98.19%> (+5.57%)	⬆️
scheduler/service/service_v1.go	79.52% <100.00%> (+14.40%)	⬆️
...ent/daemon/peer/peertask_piecetask_synchronizer.go	52.55% <0.00%> (-3.61%)	⬇️
client/config/peerhost.go	44.10% <0.00%> (+11.02%)	⬆️
... and 2 more

[hyy0322]

lgtm