[YUNIKORN-439]Parse taskGroup info from pod annotation

[HuangTing-Yao]

Parse taskGroups info from pod annotation.
Please review @yangwwei
Thanks.

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@@              Coverage Diff              @@
##             YUNIKORN-2     #204   +/-   ##
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  Files                 ?       36           
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  Branches              ?        0           
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  Hits                  ?     1846           
  Misses                ?     1181           
  Partials              ?       77           

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[yangwwei]

hi @HuangTing-Yao

I just get #203 merged, could you please rebase this.
Like offline discussed, could you please modify the type of nodeSelector to a map? that will be consistent with the podSpec

@@ -61,7 +61,7 @@ type TaskGroup struct {
        Name         string                       `json:"name"`
        MinMember    int32                        `json:"minMember"`
        MinResource  map[string]resource.Quantity `json:"minResource"`
-       NodeSelector metav1.LabelSelector         `json:"nodeSelector,omitempty"`
+       NodeSelector map[string]string            `json:"nodeSelector,omitempty"`
        Tolerations  []v1.Toleration              `json:"tolerations,omitempty"`
 }