Provide way to set store labels for TiKV during initialization

[Yisaer]

Feature Request

Is your feature request related to a problem? Please describe:

Sometimes we need TiKV Initialize with some store labels in order to schedule the data they need instead of setting labels by pd-api after tikv started.

Describe the feature you'd like:

TiKVSpec should provide a way to let users setting the initialization labels.

[Yisaer]

@mahjonp Does this feature meet your requirement?

[mahjonp]

Cool. /cc @BusyJay @cosven

[cosven]

My requirement is that different tikv pod can have different labels.

To my understanding, if we set labels in TiKVSpec, all tikv pods will have the same labels?

[Yisaer]

@cosven Your understanding is right. For your requirement, I think mixing the heterogeneous design and this feature might work.

[DanielZhangQD]

We can set labels via config here and as @Yisaer has explained, when the heterogeneous deployment is supported, we can deploy TiKVs with different labels.