api: add reservation API

[saintube]

Signed-off-by: saintube saintube@foxmail.com

Ⅰ. Describe what this PR does

Add Reservation API

Ⅱ. Does this pull request fix one issue?

#188

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

This API follows the design in #241 .

[codecov]

Codecov Report

Merging #276 (b39204e) into main (1035de1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #276   +/-   ##
=======================================
  Coverage   61.06%   61.06%           
=======================================
  Files         103      103           
  Lines        9599     9599           
=======================================
  Hits         5862     5862           
  Misses       3250     3250           
  Partials      487      487           

Flag	Coverage Δ
unittests	61.06% <ø> (ø)

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

Impacted Files	Coverage Δ
pkg/runtime/handler/docker_runtime.go
pkg/runtime/runtime.go
pkg/runtime/handler/fake_runtime.go
pkg/runtime/handler/containerd_runtime.go
pkg/util/runtime/handler/containerd_runtime.go	61.11% <0.00%> (ø)
pkg/util/runtime/handler/docker_runtime.go	90.47% <0.00%> (ø)
pkg/util/runtime/runtime.go	76.47% <0.00%> (ø)
pkg/util/runtime/handler/fake_runtime.go	0.00% <0.00%> (ø)

---

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[eahydra]

/lgtm

[jasonliu747]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eahydra, hormes, jasonliu747

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