feat: add task manager

[gaius-qi]

Description

• Add task manager.

Related Issue

Fixes #482

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 #490 (4d2a9a8) into main (ea0ae4f) will decrease coverage by 0.35%.
The diff coverage is 35.29%.

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
- Coverage   39.54%   39.18%   -0.36%     
==========================================
  Files          82       85       +3     
  Lines        6352     6438      +86     
==========================================
+ Hits         2512     2523      +11     
- Misses       3476     3550      +74     
- Partials      364      365       +1     

Flag	Coverage Δ
e2etests	∅ <ø> (∅)
unittests	39.18% <35.29%> (-0.36%)	⬇️

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

Impacted Files	Coverage Δ
manager/config/config.go	0.00% <0.00%> (ø)
internal/tasks/tasks.go	21.56% <21.56%> (ø)
scheduler/config/config.go	4.81% <22.22%> (+4.81%)	⬆️
internal/tasks/queue.go	85.71% <85.71%> (ø)
client/daemon/transport/transport.go	72.28% <100.00%> (-3.25%)	⬇️
pkg/util/net/httputils/http_utils.go	100.00% <100.00%> (ø)
client/daemon/peer/peertask_stream.go	55.07% <0.00%> (-2.54%)	⬇️
client/daemon/peer/peertask_base.go	32.24% <0.00%> (-0.71%)	⬇️
... and 1 more